Part No needed for belt for underdriven pulley
 

I've been looking at underdriven crank pulleys on ebay and need the part no. for a shorter alternator belt (no air con). Can anybody oblige, please? Thanks :)

fit the pulleys.. then get a bit of string around them.. take said string to Halfords and go along the rack until you find one to suit :)

Good idea! I'm not nearly technical enough to think of that myself :)

When I fitted them to my STi8 the belts included were too small. The original size was 880mm and the belts sent with the pulleys were 820mm. I went to my local motor factors and got a 840mm belt which fits perfectly.

Thanks Herbie :)