Seems like the Explorers are getting rarer in the yards, but worst case I can at least buy new gears in a ratio that works for me. If you want something taller than 3.2x new, you are out of luck as far as I have seen. Not that I have done an exhaustive search, but I was curious about the idea of a 8HP and started looking to see if I could get a taller gear to match and gave up after awhile.