The first mule drive/subframe, with the belt tension handle, looks like it's for a 44, 50 inch deck. The second mule drive/subframe looks like it's for a 38 inch deck. Neither are the "correct" muledrive/subframe for your 42 inch deck, so the belt chart won't help. I would do what you've done with your first subframe and deck, find a belt that fits, and if it works, go with it. I have a 108, came with a 44, 50 mule drive and an NF subframe with a 38 inch deck, and a 80 inch belt fit it. I found the correct 38 inch muledrive/subframe, i believe it's identical to yours, and I needed a 81 inch belt to use the mower deck. I think my 38 inch deck is an earlier model, hence a different belt length than the one in the belt chart. I use the implement technical section of the site to help identify mule drives, subframes, and decks, if that helps. There are really good pics in there. Just my .02.
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