I am in need of a hub/boss for a petri steering wheel anyone have one lying around?
this is not an endorsement... but, there is a guy on ebay, ego bgo (or something similar), that sells petri wheels and parts. try looking him up, if you can't find his account send me a pm and i'll get you his email address. good luck.
btw, those adaptors on ebay that you mention often won't fit - make sure that the 6-bolt pattern is bilaterally symmetric, not radially! (in other words, look at the top two bolts -they're closer together than the others).