I seen a couple of guys who swapped from v-belts to a serpentine system, but did not have the correct idler assembly to get rid of the AC compressor. The factory pieces are hard to find (actually two separate idler assemblies). At least around here. I spent awhile today trying to source other options when I came across this: Dorman part 34152. It replaces the compressor, and uses the same factory sized belt - no guessing at length. I ordered one from the local bumper-to-bumper/O'reilly's. With military discount it was $25.99. It was special order, but should be in Monday or Tuesday.