I replaced the belt on a 10550 (Duraforce 6.5 aluminum deck), but the engine was already off the deck.
I guess you could try to sneak it on after removing the black plastic belt cover. If it won't go on then you'd have to remove the engine bolts to get it on.
I found a V belt at Tractor Supply Co. that is for a MTD snowblower that is the correct length for a Lawn-Boy Duraforce mower.
Regards
Jeff
