My memory is hazy:

I think those 1990 photos might be from the lamented Pacific Coast Road Racing Championships, something a bit bigger than a fall regional. The 26 Volvo was from Oregon, and I think the 42 VW was Marty? Miller from Cal Club. The white 2002 in the same photo might be Pete Carlotto.

The 16 510 is Sal Versaggi. Not sure about the rest.