Get the entire set & belt for the 42% pulleys. You'll optimize what they were originally made for. You'll prob get about 12hp out of it as well. It's not hard, it took me about 30 minutes to do. The hardest part is removing the alternator pulley. Go rent an electric impact gun, because you won't be able to get that off without it.
If you forgot the route of the belt, don't worry, the diagram is under the hood.
__________________ 2008 Mustang GT Premium 5 speed, 3.55 gears, black-on-black, IUP, 18in polished aluminum wheels, FRPP GTA Axle Backs, JLT II CAI w/SCT X-Cal 2. 296HP & 311TQ
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