Jass Performance Hex Gearbox Filler Plug for Mazda MX-5 NA NB

£14.00 inc. VAT

4 in stock|2 more overdue from supplier

The stock gearbox filler plug on the MX-5 NA & NB 5 speeds is, in a word, crap. It has an annoying square head that is easily damaged, is very hard to reach with an adjustable wrench and even harder to get the leverage to undo. We recommend fitting this Jass gearbox filler plug as soon as you go to change your gearbox fluid. It has a 22mm hex head meaning a ratchet spanner or standard socket will easily fit over it and allow you to undo with ease.


  • Replaces square head filler plug
  • 22mm hex head
  • 5 speed only

Please note It is incredibly important to not over tighten the gearbox filler plug. We recommend using the correct factory torque specs when reinstalling.

Additional information

Shipping Weight 0.1 kg
Shipping Dimensions 5 × 5 × 3 cm

Jass Performance


Mk1 (89-98), Mk2 (98-05)

Warranty information

Warranties cover defects in materials and workmanship only. Warranty is for replacement of a similar product, repair of the original product or refund of the purchase value only and excludes all labour and incurred charges including towing, fitting, inconvenience, and purchases of other manufacturer's products. The warranty is good for the period stated in the additional info tab from the date of purchase. Mileage warranties are for road use only and proof of mileage is required. Products must be installed by an independent experienced professional mechanic and the suspected defect must be present at the outset. The warranty does not cover damage caused by incorrect installation, failure to comply with the maintenance requirements of the vehicle, processing or otherwise changing the product, ordinary wear and tear, or any other external influences. Warranties are invalid if the product is used for racing, rallying, drifting, track days or any other form of motorsport or competition. Please refer to the manufacturer's own warranty documentation for more information.

Making a warranty claim

Proof of purchase receipt showing the date of purchase, proof of mileage at installation, proof of current mileage and invoice of the work undertaken by an independent experienced professional mechanic must be supplied along with the returned products for a warranty claim to be considered. If your vehicle needs to be used whilst your warranty claim is considered replacement parts from the same manufacturer should be purchased through BOFI Racing. In the event of a successful warranty claim, we will refund the card that was originally used to purchase the replacement parts, in full or in part depending on the nature of the claim. BOFI Racing reserves the right to make full or partial compensation at its sole discretion depending on the condition and mileage use of the returned suspect parts. For example, if you have used the part for several thousand miles before a defect is noticed, only partial compensation may be offered.

Make Model Year
Mazda MX-5 I (NA) 1989 - 1998
Mazda MX-5 II (NB) 1998 - 2005