A '95 shouldn't have had metric tires on it as original equipment. I'd guess someone put those on right before they sold the car as the original tires were probably no good anymore and they either had that set of metrics around, or got them for free from someone else.
As Shogun said just use standard wheels/tires since those metrics are expensive, and really aren't any good. Not to mention if you want to keep the car original you should take the metrics off as those aren't original on a '95.
Put one of your BBS sets on it for a while and find out what the '95 518SE came with from the factory and fit those at a later date if you don't end up actually having a set right now.
Cosmos Black/Black 1995 540iA M-Sport
BMW Individual Exclusive Edition, 1 of 65 total, 9/25/95 Build