Challenger MT285B, Kubota L4150 , Farmall super A, Farmall Cub
Montage enterprises is the place to get your parts. I just replaced all the blades and pins in a mott 7' mower. What a fabulous difference in the smoothness of the operation.
Montage is the place to go, I have old 5' Mott model 72 that I am restoring. I didn't know what brand or model it was, so I emailed them pics and they identified it for me. The can even email you a diagram that show all the parts and how they go back together. They have all the parts for your Mott.