wow... my first e30 post... feels wierd to be on the other side of the forum

Anyway... my e21 alloys will fit the e30 (they weren't really the right offset for the e21) but they don't sit on the stub axle. The centre hole is too big. I have run them on the e21 like this for 8 years without problems, and was just wondering whether this is a problem for the e30?
I notice that the stock steelies on the e30 do sit on the stub axles, where as the stock e21 rims didn't (which is why I never worried about it before!)
Cheers
Luke