E30 M3 Steering wheel

[neilboi]

Hi all
New to E30 zone. Hoping you could help...
Just bought an E30 M3 Evo 3 steering wheel from BMW North Oxford.
Had a look on ebay and one guy always has one for sale, he states its the "rare smaller 370mm wheel".
Just wondered if all the Evo 3 wheels were all smaller diameter?
Were all suede covered wheels smaller diameter? Were some E30 M3 wheels a larger diameter?
Thanks
Neil