Mower belt length

Can anyone tell me what the length of the long mower belt is for a LoBoy 185 with a 3160 mower and 13.6x16 turf tires on the tractor? Mine had a belt that is 126" long but was an "A" width belt. I want to replace it with the proper "B" width and the 126" length is too short.

Seahaul, The Case/IH parts info shows the correct belt for a 3160 (not the 3160A) is a 542177R2 which IH dealers sell for about $60. 542177R2 crosses to PIX Kevlar reinforced belt # B124K which is listed as being 5/8" x 127" x 13/32" deep and sells for about $30. Hope that this helps, NJDale

That's exactly the info I was looking for. Thanks very much.
My parts book (for the mower) did not have the long belt listed, only the two short ones.
This website is absolutely the greatest, thanks to kind people like you. Thanks again!
Seahaul

I buy my belts at mcmaster carr industrial supply and there here within 24hr's at half the cost too.