it really doesn't matter how many of the standard 635's were made(comp.to M6) since they were virtually identical yr.to yr. The six's sold well, not as well as E28's or todays 3 series which are a dime a dozen, but certain cars like the 1988 M6 which had all leather interiors incl. the dash are going to be more unique. The 635csi "HighLine"is also rare enough to hold extra worth because the uniqueness. Anyway, I have a link to a site that has model outline and production figures yr.to yr. and as soon as I find it I'll post it for you.