Which belt to use for underdrive pulley

[cp2295]

I have a 98 4.0 ohv without a/c. I was looking at the pulley on summit for the 4.0 mustangs (25% underdrive I think). All I can find as far as belts go is the belt to use with a sohc engine with a/c

 

[holyford86]

Just use a piece of string that doesnt stretch or piece of stranded wire, have a helper hold the tensioner back, route the wire accordingly ,making sure to keep it all in the same groove, mark it where the ends meet and measure it. When you go to the parts store tell them you need a 6 rib belt x.x inches in length