Self propel belt size

I've run into a bit of a problem in trying to get my Ariens self propel back in working order. The belt part number of aftermarket belts lists the belt as a 3/8x32.5" (9.5mmx838mm), or 3L325 V belt. No stores carry this size that I can find, and I've spent hours looking and calling. I don't want to buy online and pay 3 times the worth of the belt in shipping costs. The closest I've found is 3L320 and 3L330. Half an inch would translate to 1/4 inch longer or shorter distance betwixt the pulleys. Is there enough play in a mower's system to accommodate 1/4" difference one way or the other?