Heya, I have several Gibraltar clamps left over as I recently re-did my entire rack and changed out all of my accessory clamps. They are model #SC-GRSMC. I probably have at least five or six of them but I'd have to double check when I get home later on. If that is what you are looking for I'll take a pic of them and email it to you if you want. They normally sell for $20 bucks each, brand new. Since they are used, still in great condition, just a little nicked up, I'll sell them to you for $10 bucks each, plus shipping.
I might also have some other miscellaneous assorted clamps but I'd have to check the old hardware bag of stuff I haven't used in awhile. It just piles up and I forget it's there.