Steering wheel spline size

Hey everyone, can't find the answer to this anywhere, what size is the spline on a 1995 K11 Micra non pas?

I have a momo steering wheel from my old MX5 which I would like to fit and I have seen a boss on eBay for £8 which says fits all models (heard it before) and the splines are 15.5mm. Will this fit?

Cheers
Matt
 
The holes on the steering wheel don't quite match up with the holes on the boss. I knew Mountney M wheels were different because the specific bosses come in at nearly £60; now I know why :/
 
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