if it's an original it would be the SM420 but the bellhousing is engine-specific, not trans, and you can measure the clutch to get the same from a FLAPS

Bill

Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot