2021 Mustang Belts – OEM Serpentine & Accessory Belts for Smooth, Reliable Operation

2016 Lincoln MKX

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Keep Your Mustang's Engine Running Strong

The belts in your 2021 Ford Mustang drive essential systems like the alternator, A/C compressor, water pump, and power steering. If your belt is squealing, cracked, or slipping, it’s time to replace it before it causes a loss of function or leaves you stranded.

These OEM-spec serpentine and accessory belts are built to match your Mustang’s engine layout and accessory routing—whether you're in a 2.3L EcoBoost, 5.0L GT, or 5.2L GT500. They deliver long-lasting durability, silent operation, and perfect fit.

Door Belt Molding Bolt

Part Number: W709451-S450B
Ford Ford
Other Names: Belt Molding Bolt, Belt Molding Screw, Run Channel Bolt, Window Regulator Screw, Lower Guide Bolt, Run Channel Screw, Applique...
Replaces: W716434-S450B
Description: Crew cab. Super cab. M4x1.79x10. 2017-20. 2021-23. Run channel,screw. Regular cab.
MSRP $4.00
$2.34

Outer Belt Assembly Pin

Part Number: BB5Z-0923-A
Ford Ford
Other Names: Mount Assembly Bolt, Seat Belt Mount Bolt, Belt Tensioner Bolt, Shoulder Belt Bolt, Tensioner Bolt, Seat Belt Shoulder Belt Bolt,...
Replaces: BB5Z-923-A, JL3Z-0923-A, JL3Z-923-A
Description: 2nd row 60/40 seat with inflatable seat belt. Shoulder belt,bolt. Crew cab, with inflatable belts.
MSRP $14.53
$10.20

Motorcraft™ Serpentine Belt

Ford Ford
Other Names: V Belt
Description: Water Pump, Alternator and Compressor. MKX. 2.7l. Nautilus. 2.7l. Edge. 2.7l. Continental. 2.7l. Continental. 3.0l. F150. 2.7l. 2.7L...
MSRP $57.45
$36.66

Outer Belt Assembly Nut

Part Number: W623484-S2
Ford Ford
Other Names: Belt Tensioner Nut, Tensioner Nut, Nut Hex
Description: With inflatable belts.
MSRP $5.00
$2.93

Center Seat Belt Upper Bolt

Part Number: W704400-S437
Ford Ford
Other Names: Center Seat Belt Bolt, Bolt
Replaces: W704400-S309
Description: With inflatable belts.
MSRP $5.00
$2.93

Outer Belt Assembly Upper Bolt

Part Number: W504775-S424
Ford Ford
Other Names: Outer Belt Assembly Screw, Seat Belt Assembly Bolt, Outer Belt Assembly Bolt, Screw
Description: With inflatable belts.
MSRP $12.00
$7.02

Pre-tensioner Seat Belt Retra

Part Number: FA1Z-58611B09-AZ
Ford Ford
Positions: Front left
Replaces: FA1Z-58611B09-AD, FA1Z-58611B09-AT
Description: Ebony. MKX. Front. Nautilus. Left.
MSRP $549.77
$369.44

Motorcraft™ Accessory Drive Belt Tensioner Assembly

Ford Ford
Other Names: Motorcraft™ Belt Tensioner, Motorcraft™ Serpentine Tensioner, Pulley Assembly Tension
Description: MKX. 2.7l. Nautilus. 2.7l. Edge. 2.7l. Continental. 2.7l. Continental. 3.0l. 2.7L turbo.
MSRP $187.27
$119.48

Outer Buckle

Part Number: DB5Z-7860045-EH
Ford Ford
Positions: Rear left
Other Names: Latch, Seat Belt Assembly
Description: MKX. Second row. With inflatable belts. Left. Quartz.
MSRP $233.10
$162.24

Outer Buckle

Part Number: FT4Z-5860044-AB
Ford Ford
Positions: Rear right
Other Names: Latch, Seat Belt Assembly
Description: MKX. Second row. Right. Without inflatable belts, cappuccino.
MSRP $75.33
$52.43

Outer Buckle

Part Number: FT4Z-5860044-AC
Ford Ford
Positions: Rear right
Other Names: Latch, Seat Belt Assembly
Description: Edge. Second row. MKX. Right. Without inflatable belts, ebony.
MSRP $75.33
$52.43

Outer Buckle

Part Number: DB5Z-7860045-EF
Ford Ford
Positions: Rear left
Other Names: Latch, Seat Belt Assembly
Description: MKX. Second row. With inflatable belts. Left. Cappuccino.
MSRP $233.10
$162.24

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Why Choose OEM Belts?

OEM Fitment – Matches factory routing, tension, and pulley design. 

Prevents Failures – Avoids sudden loss of charging, cooling, or accessory function. 

Durable Construction – Made from heat- and wear-resistant rubber with reinforced cores. 

Efficient Operation – Runs quietly under load and resists cracking or stretching. 

Easy Installation – Direct replacement with no modifications required.

Compatible Ford Mustang Models

Fits 2021 Ford Mustang, including:

  • EcoBoost / EcoBoost Premium (2.3L Turbo I4)

  • GT / GT Premium / Mach 1 (5.0L V8)

  • Shelby GT500 (5.2L Supercharged V8)

Confirm engine and accessory layout to ensure correct belt selection.

How to Replace Belts on a 2021 Mustang

Tools Required: 

✔ Serpentine belt tool or long-handled breaker bar 

✔ Socket and ratchet set 

✔ Flashlight or work light 

✔ Gloves 

✔ New OEM belt

Installation Steps:

  1. Locate the Belt Routing Diagram under the hood or in the service manual.

  2. Use the Belt Tensioner Tool to release tension on the existing belt.

  3. Remove the Old Belt, inspecting for wear, cracks, or fraying.

  4. Route the New Belt according to the factory layout.

  5. Reapply Tension, double-check alignment, and ensure it's fully seated.

  6. Start the Engine to verify quiet, stable operation.

Pro Tip: Always check your belt tensioner and idler pulleys while replacing belts. Worn components can shorten belt life and create noise.

Signs You Need a New Belt

🚙 Squealing or chirping on startup or acceleration 

🚙 Cracked or glazed belt surface 

🚙 Loss of power steering, alternator function, or engine cooling 

🚙 Battery warning light 

🚙 Slack or visible misalignment in the belt path

Belt Options for Your 2021 Mustang

🔹 OEM Serpentine Belts – Quiet, factory-fit belts for daily driving and stock setups 

🔹 Heavy-Duty Performance Belts – Reinforced for high-RPM or high-output engines 

🔹 Accessory Belts – Engine-specific options for multi-belt configurations

Popular Related Parts for 2021 Mustang

🔹 2021 Mustang Belt Tensioners – Maintain proper belt pressure and alignment 

🔹 2021 Mustang Idler Pulleys – Guide belt movement and reduce friction 

🔹 2021 Mustang Alternators – Ensure reliable charging across all driving conditions 

🔹 2021 Mustang Water Pumps – Keep your engine running cool under load

Get Your 2021 Mustang Belts Today

Don’t wait for a belt failure to interrupt your ride—replace worn belts with OEM-quality parts built for strength, precision, and long-term performance. 

🛒 Upgrade Your Ride 🚙 – Shop Now!

Chevrolet Silverado 1500 Brake Pads - FAQs

FAQs About Chevrolet Silverado 1500 Brake Pads

  • How often should I replace my Silverado 1500 brake pads?

    Brake pads typically last between 30,000 and 70,000 miles, depending on driving habits, terrain, and towing frequency.

  • What are the best brake pads for towing with a Silverado 1500?

    Semi-metallic or performance brake pads are ideal for towing as they offer higher friction and heat resistance.

  • Do I need to replace my brake rotors when changing brake pads?

    Not always, but if your rotors are worn, grooved, or warped, it’s recommended to replace them for optimal braking performance.

  • Can I install Silverado brake pads myself, or should I take it to a shop?

    With basic mechanical skills and the right tools, you can install them yourself. However, professional installation is recommended for those unfamiliar with brake systems.

  • Are ceramic or semi-metallic brake pads better for my Silverado 1500?
    • Ceramic brake pads: Best for daily driving, low dust, and quiet performance.
    • Semi-metallic brake pads: Ideal for heavy-duty use, towing, and high-performance driving.