Go to eBay and do a search for BMW OEM E38 WHEELS. The hit list should
include the E34 for the donor wheels to fit.
As a matter of fitment, a 195/60x15 works out to a nearly exact match to a
225/50x16. The 235/60s will wreak havoc with the speedo and may give you
problems with the fender openings.
Ebay is the last place I'd trust to give info on what fits what.
I agree if there is only one hit. If there are several hits from different
vendors, then I begin to trust that all of them will not be complete idiots.
Some might not know their ass from a hole in the ground, but people that
make a living selling this sort of thing will not make much for very long if
they don't know what their product fits.
I do not know if the 7 Series wheels fit the 5 Series cars, or not, but
surely the people that sell the wheel sets will know.
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