Due to the design of them I needed 90 degree valves on a set of BK Racing wheels yonks ago - on my old Mondeo.
couldn't tell you if they are the same as bike ones, but certainly they exist for cars
Jim, looks like these adapters would do the job:
http://www.ebay.co.uk/itm/PAIR-MOTO...255?pt=LH_DefaultDomain_3&hash=item33860870ff
I have been digging for car valves; I don't suppose you remember what/where etc?![]()