26 February 2026
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Speak to one of our experts.
15 October 2024
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Advice Blog
If you’re an MX5 Mk3 (NC) owner, you already know the thrill these cars provide on the open road. Mazda designed them with fun in mind, but if your rear differential carrier bushes are still the original rubber, it might be time for an upgrade. We’re excited to introduce the 27AY Rear Diff Carrier Bushes, designed specifically for your MX5 NC (2005-2015), engineered to exceed OEM specifications while preserving that factory comfort you love.
OEM rubber bushes are prone to degradation over time, particularly due to compression set—where the rubber permanently deforms after prolonged stress. This issue affects handling and ride quality, making your car feel sluggish and less responsive. Polybush’s polyurethane formula offers a brilliant solution to this problem. Unlike rubber, polyurethane is resistant to wear, heat, and oil, meaning it can maintain its shape and performance for far longer.
The 27AY bushes are designed to improve your MX5’s responsiveness without sacrificing the ride comfort you’re used to. Polybush’s material absorbs vibration and harshness while maintaining the rear differential’s position more effectively than standard rubber bushes. This upgrade translates into sharper throttle response, more precise gear changes, and overall enhanced handling.
One of the key reasons to swap out rubber for Polybush is longevity. While rubber wears out and cracks under the pressures of daily driving, our polyurethane bushes stay flexible and tough for years. So, whether you’re planning track days or want to keep your roadster in top condition for weekend drives, the 27AY bushes will ensure your MX5 stays on point, providing years of trouble-free performance.
The 27AY Rear Diff Carrier Bushes are part of our broader range of suspension upgrades for the MX5 NC. At Polybush, we’re committed to covering your car from top to bottom, offering you products that outperform the originals while maintaining the features that make your car so enjoyable to drive.
If you’re ready to transform the way your MX5 drives, then this is the perfect upgrade to keep your pride and joy in top shape.
OE Reference: Part of NE5539730,NE6139730
Bushes Per Vehicle Set: 2
Rear Differential Carrier Bush
Polybush 27AY – Polyurethane Suspension Upgrade (2 bushes per set)
Replaces OEM Part of NE5539730,NE6139730
Product Details:
Kit Contents: 2 x Polyurethane Bushes (Full Vehicle Set)
Weight: 0.51kg
Part Number: 27AY
OEM Cross Reference: Part of NE5539730, NE6139730, F15139730A
Bush Type: Top Hat
Fitment:
Mazda MX5 Mk3 NC (2005-2015)
Mazda RX8 SE17 (2003-2012)
Why Choose Polybush?
If you’re replacing tired, perished rubber bushes, Polybush polyurethane bushes are a smart long-term upgrade. Here’s why:
– Longer Lasting: Polybush bushes last significantly longer than standard rubber – they are resistant to oil, road grime, and age-related cracking.
– Improved Handling: Firmer than rubber, they reduce unwanted flex and improve steering response and stability, especially under cornering loads.
– Comfort Maintained: Engineered to retain OE ride comfort while improving feedback and control – ideal for fast-road, touring or heavy load conditions.
– No Grease Required: Unlike other polyurethane bushes, Polybush products are dry-fit, meaning no messy greasing or squeaking over time.
– Made in the UK: Manufactured to high tolerances in the UK using our unique polyurethane blend.
Key Benefits at a Glance:
– Direct replacement for your original suspension bushes.
– Sold as a full vehicle set – No need to buy multiple sets
– Maintains comfort while improving drivability
– Resistant to wear, chemicals, oil, UV, and weather – perfect for daily drivers and performance builds alike
– Backed by the Polybush reputation for quality. ISO:9001
Ideal for:
– Daily Driven Vehicles looking to maintain or restore OE comfort and performance
– Fast Road or Lightly Modified Cars needing better control without sacrificing ride quality
– Classic or Older Models where OE rubber has degraded or split
– Fleet, Commercial, or 4×4 Vehicles needing durable and consistent suspension performance
Upgrade your bushes today with Polybush – A long-lasting, British-made solution for sharper handling and reliable comfort.
– In Stock – Fast Dispatch
– Trusted UK Manufacturer – Polybush
OE Reference: Part of NE5539730,NE6139730
Bushes Per Vehicle Set: 2
