I've seen both 1.125" and 1.25" in the TF years [55-59, but same brakes as 54], 1.125 is factory standard, but maybe there was a 1.25 "heavy duty" option, or some aftermarket had that bore, but the 1.125 is all I've found at any vendor, either repro or local

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