I found this site looking for my 1993 Blazers RPOs http://www.compnine.com/index.php
Found some neat info
Vehicle: BLAZER 1/2 TON Year: 1993 Build Date: 1993-05-13
Found 40,272 vehicles matching your year and model in our database.
Rarity...There are 2 1993 BLAZER 1/2 TON vehicles (0.005%) matching your exact options list. There are 2 (0.005%) with at least as many options.
Why do I find these orphans the 1987 was a strange one and now this one 
Found some neat info
Vehicle: BLAZER 1/2 TON Year: 1993 Build Date: 1993-05-13
Found 40,272 vehicles matching your year and model in our database.
Rarity...There are 2 1993 BLAZER 1/2 TON vehicles (0.005%) matching your exact options list. There are 2 (0.005%) with at least as many options.
Why do I find these orphans the 1987 was a strange one and now this one 
