Mack R? or U? floorboard plate treadle mount

[Frank Y]

Not sure exactly what this plate fits. Broken treadle mount was Mack. No rust through on the floorboard and it has the cage nuts. Dusty from sitting.  Not sure its even worth saving but I figured Id give it a chance.

[Vladislav]

Looks like a R/Superliner floor panel to me. But could be for a U/DM, I'm not almost sure at the moment. The difference is the threadle valve hole location so not difficult for visual check. These things have value since tend to rot. Someone was even looking for one on here a few moons back. I'd grab it for some bucks if have less headache with shipping.

Edited December 22, 2021 by Vladislav