but then you also have to buy the bracket witch is close to $300
https://www.dcpowerinc.com/brackets-and-kits/dual-bracket/gm-vortec-dual-alternator-bracket.html
300 bucks for that braket?! damn. I would make my own.
comes with the bracket, idler pulley, all the hardware, and high performance gates belt
macking a bracket would be pretty hard IMO to get everything perfectly lined up and straight and good solid welds