I was out looking at some 07 vettes the other day and noticed that some of the door sills were silver and black not the black rubber piece. they looked great but nobody at the dealer could tell me why some cars had them and some did not. i know GM has some brushed aluminun and black but that is not what these look like. below is a pic of a red vert with the ones i am looking for and there is a pic of what GM acc catalog has. can anyone help? they are not billet either.