This may help. It's the 52" deck from my Conquest. Note that there are 2 belts, and the pulleys for each are in a single plane. One goes to all 3 spindles and the lower idler, the other goes to the PTO on the engine, the left spindle, and the upper idler. The white shoelace on the idler arm is actually a piece of parachute cord I use to pull the idler arm for install and removal. Don't leave it in place after install.
I was surprised to see that the manual doesn't mention belt replacement for the 52" deck. Apparently those of us who have one of those are rich enough to take it to the dealer for belt replacement.