Ford being Ford, used that basic rear end from '49 through '56 though the '56 had a different spline axle (numbers I've forgotten) but can be used in a Mainline, Customline or Crestline model as they for all intent, used the same frame and body pieces. The Dana Bogie mention was used on station wagons and Mercury's - but not necessarily 100% coverage on either vehicle type, As far as strength - not very good for much above the original 90-125 horsepower. I blew way more then I care to remember with a full race flathead then a 312 'Y' block in my '53 Customline, but at 15-25 bucks in a junk yard, easy to change when piece started breaking. I'm sure that bearings and seals can be relatively easy to find though the gear sets will be difficult and pretty expensive when found with the paper version Hemming's possibly a good source