many of these busses run 2 belts.. i know my DT-360 engine has dual belts for the fan / water pump. im not sure on the fords, V-belt style routing like you have is likely fairly simple.. a belt in a V-drive system like yours will never drive on the back-side of the belt.. a commerical paerts shop May have a belt routing diagram for your engine, possibly a ford dealer can get it for you.. these engines / busses had many options.. unless i have the old belt its often best to get the belt part numbewr by calling a dealer and giving them the VIN.. (you are not obligated to buy the belt from them just by calling... though they will want you to)..
-Christopher
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