Kenny, I should have been more clear. You can use any (thier called) mule drive for a narrow frame. Unless it's specific to the rototiller you may have to heat and straighten the mounts for the idler pulleys. The mule drive for a mower deck cants the pulleys to point them toward the center deck pulley. you would need to make them point straight to the rear gear box. The other thing is, if you look at the holes in the front of the mule drive you posted the right side is for an L shaped bolt that you'd use to adjust the belt tension, the holes on the left are for a spring that holds tension on the deck drive belt. To use it for a rototiller you'd put anouther bolt on that side, the spring won't let you tighten the long belt enough. Hope you get it running, again good luck.