I have a 42in bolt on deck the I want to modify to use on a 149 wide frame. the deck I have is missing one of the belt drive outer pulleys which use a square key to mount the pulley. I believe the deck # is IH 477594 R21. If that is correct I would like to get a parts break down. The belt tensioner is in a slot and must be slide and tightened up to work and the side ends are cast iron. Any help will be useful. Thanks