S13 SR20DET - Underdrive Crank Pulley Belt Help

[BoostMunchies]

Hi, I've searched the forum and also many other pages online but have not found any results. I need to get belts for my sr, just PS and ALT belts, but I have an underdrive crank pulley and was wondering what belts people have used from other vehicles that compensate for the difference in size? Don't think this matters but the pulley kit is from the overrev group. Any help is greatly appreciated.

Thanks

[ultimateirving]

You can go to checker and try some different length belts it really doesnt matter just make sure its tight... Better yet ditch the underdrive shit and put the oem stuff back on.

[TheRealSy90]

Go back to oem, those underdrive pulleys do not harmonically balance the rotations of the engine.