Went out on the weekend, got to the gas station Sunday morning to find (about a 1/4 tank later and almost bone dry) that someone had stolen my gas cap. Was thankful that no one decided to dump anything in there while they were at it. Anyway, went looking for a locking cap, decent parts store with the books, but none listed a locking cap for Blazers, only pickups, even though the non-locking cap was the same part number for both. Is there a specific difference in the the filler necks that would make this so? Picked up a cap and ordered the locking pickup one to see if it would work as is or with minor mods. Anyone know? I'll post again when I get it.