I took Denny's back spacing as correct... 13mm is .51" so an 8" wheel with a .51" positive offset would have a 4.51" back spacing.
.98" is correct for the 25mm positive offset and on a 9.5" wide wheel would make the backspacing 5.73".
The 4.75 (8" wide wheel) and 5.5 (9.5" wide wheel) front and back are what I've seen as the largest recomended for front and rear disc converted 1st gens. I know drums in the rear 5.5's work but tend to be a little tight on the inside. I don't think 4.75's would be a good idea with drums up front. Just bringing that up as it shows there are margins of play involved and the bmw wheels might indeed fall within them...
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