So I am getting around to putting a belt on my 5.3(pulled from 2001 suburban) after about...ohhh 6 months or so of not messing with the truck. I have totally forgotten whether or not the tensioner was the actual one that came on the sub water pump, or where it came from or what. But my serp belt is attempting to go groove side on the smooth tensioner pulley..wtf?

PS(Ignore those wierd brackets between the tensioner and the waterpump, that was a quickly abandoned compressor bracket mockup)*
PPS(oh, and the alternator is there now as well.)*

Do i have an f-body tensioner pulley, or whattt??