Auburn 680 Fan & Generator Drive Belts

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I need to buy the drive belts for the fan and generator on my 680.  I cut the tattered old ones off before starting the rebuild.  I don't have them any more.

I know how to calculate the lengths, but I'm not sure which width to get- ie 4L, 5L or other.  The widest width of the v-groove on the pulleys is approximately 3/4".  So I'm thinking "5L" or "B".  Do any of you used cogged belts?