The belt tensioner comes as one unit, as far as I know you can not buy just the pulley. It's real easy to do, take the belt off, and undo the one bolt holding it in. And then replace with the new belt tensioner. You don't really need a belt diagram, just pick a pulley to start at(other than the belt tensioner of course) and follow the pulleys. Where there are grooves you know that the side of the belt with the grooves goes on it, and the flat pulleys take the other side of the belt. And then make your way back to the belt tensioner and slip the belt on it last. Before you start the car, bump it over once or twice to make sure everything is lined up, but don't let the car run. And then once everything checks out you're done.
03 Mach 1: New toy 00 Kenne Bell GT vert: Sold 04 Sonic Blue GT: Missed 96 GT: First. Sold. 06 F250 6.0L 4x4: Studded, EGR delete, IDP tunes, 5" Straight pipe, S&B CAI