[Ianr]

Originally Posted by Stot

MK1 splines are never an inch. They take a 17mm nut IIRC and 15mm sounds right. NA and NB Mazdas are the same, dont know about NC.

http://www.demon-tweeks.co.uk/perfor...wheel-boss-kit

Same boss for 90-05 cars.

Sounds to me like your boss is wrong.

Cheers
Stot

Thanks Stot - that is exactly what I thought, I have been back to the seller of the boss who is insistent on it came off a 1.8 MX5. Looks like I will have to buy another.