I've never seen any... Ended up using a 8 1/4" out of a Diplomat with a final in the high 2's and a new driveline in a '50 Chrysler Royal... Better brakes and same lug pattern as well...
check '54 to '56 Powerflite equipped cars. I found one in a '54 Dodge that had a Hemi/Powerflite. honestly, you're better off switching to a rear that's easier to get parts for, like a 8 1/4 Mopar, a Dana 44, or an 8" Ford.
I don't understand why you'd keep the rearend that you need a damned industrial-strength puller that could also be used to pull a locomotive down the track, to get the drums off to do a brake job. I think I'd rather put new shock and 4-link brackets on a rearend once, than have to pull those drums more than once. Well, at least I assume it's like most other '50s Mopars with the tapered axle rearend in it. I suspect by the time you buy the puller, the new gearset, and the stuff for new brakes you could have bought two newer used rearends and put new brakes and brackets on them.
here's what I've found.. there isn't anything for those other then bearings and seals. they were the predecessor to the 8 3/4 rear. they're bullet proof but don't have any aftermarket support. I've found a 8 3/4 out of a full size is the same width. and if you have a welder and a cutoff wheel its like a 2 hour job to swap.