My son has just bought a 1990 Miata that I am helping him to fix up and he wants to change the four spoke steering wheel to a three spoke one.
If anyone has an original three spoke wheel left over I would be interested to buy it.

Other upgrade parts might be of interest aswell if you have anything that is just collecting dust.

My first port of call would be Andrew at Autolink MX5 - all round good guy, sensible prices and has most parts available new or second-hand.
There are other suppliers in the market...

The original Momo wheel with the crash pad fetches quite a bit of money nowadays, just so you know (I've seen really good condition ones go for over £100).