Eric I read your post too late. This was a horrible experience!!
But thru trial and error I figured out that it had that bottom retaining brakcet and i removed the outer PTO pulley. Also I had to remove the muffler and side flang to be able to pull that main belt belt guard straight out. I also learned that you have to install the belt on the middle pulley and put the guard back on it first, really hard a bolt way at the top, then you roll the belt on the motor pulley (Not easy either alot of tension) if you dont put that middle belt guard on first the tension positions the pulley where you cant get the bolt in I had to take the belt back off the main pulley and then install the pulley guard and bolt.
The rear main belt aint is bad, just pull the pulley off the tranny 3 Bolts install belt and but bolts back in pulley.
I installed the new mower belt on the PTO just have to figure out how to route it.
This pic is after I put Dewey back together and shows my new JD $65 headlight blank off plate