deck belt help please

well i really need some help with this one, mtd built wizard 42in deck with the junk deck drive where you have to lower the deck to engage the blades, all the model numbers are gone so i don't even know the year, and i need a deck belt, the original belt is gone so i can't get anything from it, if anyone can help me with a size or part number i'd greatly appreciate it

well never mind, my brother picked up a craftsman dyt 4000 for $50, it's sat for awhile, the steering was froze up and the kohler on it has some ignition issues, so we're are taking the 16.5 off this and putting it on the craftsman until we get the kohler fixed