Eleven inch brakes make a significant improvement especially with regard to "fade" and as Sniper points out, you need the knuckle which matches the backing plate. Should you choose 12 inch brakes, the Plymouth 15 inch wheel will not fit, but the 15 by 4 1/2 Chrysler and Desoto will. Dodge USA drums have a flat flange and use a wheel with a different offset but all could be used under a Plymouth. I once bought a 54 Plaza which had been a police car and am still using its eleven inch brakes. ( or parts of them anyway)
As for the Torrington needle upper bearing, Canadian built Plymouths also used these, possibly to offset the extra weight of the longer engine. In my many many years of servicing these cars, I have never found one worn out. I wish I could say the same for the bearing which actually carries the weight.