I have a flywheel for a Farmall M and possibly Farmall 400 and 450. Measures 12 inches across inside. This was surfaced machined in 2014 at D & H Machine Batavia NY ( prior to being purchased by Caledonia Diesel ).
Crate says fits M , 400 , 450. It is super clean and looks ready to use. Reduced price 9-6-26 to 75.00
Cash only at pick up.