wow, guess we all missed this one! hope 58truckie didn't get discouraged at us!
Kev - the belts, being afterthoughts, don't have a specific place to attach, pick a spacing that works for you and drill holes in the raised rib just in front of the tank, where the tank straps attach - doubled there and strongest - use large flat washers under the floor or make up some reinforcing plates, bolt'em in and yer done
Bill