Welcome aboard !
Gotta say, don`t hold your breath on that one ! E30s are from 20 years ago, when 17-inch wheels were considered HUGE....19s were not even in the realm of reality for a long time after that. The biggest 4-bolt wheels I`ve ever seen are 17s, so you will probably have to settle for that. They would certainly look healthy on a tiny little E30, though....
You should sign onto the E30 Forum !
The road goes ever onward....
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When faced with choosing between two evils, always go with the one you`ve never tried before....