its hit or miss, pulley sets are different..few options
1.try the stock belt
2.if its too big,go to the parts store and buy the next 3 or 4 sizes smaller than the stock belt(take all 3 or 4 belts home,find the one that fits the best and return the rest)
3.tighly wrap a string around the pullies in the proper belt routing pattern and tie it off..take said string to the parts store and say "here,i need a belt this size" lol