mint93sc, this is the first time I have heard of the accessory belt (or any other belt) being a different size on the 93-95 SCs. Are you sure that is correct? Maybe some pulleys have been changed on your car?
All the parts places I look at show the same belt 89-95. I believe the belt length is 89.7" from the part numbers.
Maybe Fast Ed our resident Ford parts expert can give us a "final" answer on this one!
I bought belts from a website that had 89-92 listed and figured they would work, the supercharger belt and jackshaft belt were perfect, but the accessory belt was about 1 1/2-2 inches short by what i could measure.