Here's another cool item I found on Ebay when I went looking for a H3 OEM locking gas cap for the CE since it came with the nonlocking OEM gas cover/door and nonlocking cap.
I like this one for 2 reasons - the key hole cover says "H3" and it comes with the tether line attached (the other, more common version of the GM H3 OEM locking gas cap comes with neither of these 2 things and it's a PITA not to have the tether, as it's only a matter of time, if you're like me, that you're going to drive off without the cap and have to buy another one!). So, if your'e in the market for one, I'd recommend this one:
http://www.ebay.com/itm/220902470701?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
I like this one for 2 reasons - the key hole cover says "H3" and it comes with the tether line attached (the other, more common version of the GM H3 OEM locking gas cap comes with neither of these 2 things and it's a PITA not to have the tether, as it's only a matter of time, if you're like me, that you're going to drive off without the cap and have to buy another one!). So, if your'e in the market for one, I'd recommend this one:
http://www.ebay.com/itm/220902470701?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649