i think they are little plastic tab inserts, let me see if i still have them. they gave a few different ones but as long as it's a picatanny style rail you don't need them. i think they had keys for the S&W's too and i didn't need them. this was mounted on my H&K and S&W as is. i'll check and let you know.
I don't think you need them. I bought a TLR and ran it for a while. Just got old as I couldn't holster it. I never had any "keys" for mine. And it wasn't specifically for a Glock. Unless you have a Gen4 and they are different...
i'd really like $150 since i'm paying for shipping and with insurance it's probably going to run me 10-20 bucks plus i'm gonna lose another 5-10 in paypal fees. I hate to come off as a cheap ass but I priced it this low from the start on purpose.