07 GM truck spare question

okay, we had an 07 silverado in our shop a while back and i noticed it had a multi (7ish) spoke spare tire under the bed. it was black and a 17". dont know the backspacing or width. also, if its alloy or steel cast. id assume alloy. sweet wheel. is that standard on all the half ton 6x5.5" trucks? or just certain ones? id like to track down 4 of the rims if i can. anybody want to donate them to me one by one?

anybody have one of these or worked on them? techie at GM have info to get out of the books or computers?

i haven't seen one but i worked for 5 years in a oem wheel plant. i think its there new smart wheel. its a base platform that will let you take the same size center and put in on many different rims. thus costing less, then you just change the hub hole and bolt pattern