I have a signature elite 2000 riding mower but the model number is worn off. It's an 18 horsepower, with a 46 inch deck. I'm attempting to install a deck belt without the diagram. Without the model # the guys at the mower shop can't help me. I've tried 1/2 in.belts from 76" to 78". Seems like an easy fix but I'm stumped. Any info would be greatly appreciated.Thanks