I've got one of this style
https://www.ebay.co.uk/itm/Genuine-F.../152711897351?
as fitted to the X1/9 Bertone steering wheel - the screw pcd matched my momo wheel, can't remember whether the central raised boss was the right size for the momo wheel though as I machined it off to allow me to bolt a quick-release adaptor between the hub and the momo wheel.

Not tried to fit it yet so may all be moot if the steering column shaft splines have been modified - very interested to hear more on this thread.

Graham