IMO 99% of these things are the same, or at least close enough, I say go grab the complete backing plate package (pretty inexpensive really) and the bearing kits with the seal, (they measure the shaft, in and out bearing) unless someone put a queer axle under it, this should work like a champ (now where did I hear that before?)
BTW these typically use 1960's Ford Mustang rear brake shoes (9" rear end models), but an odd ass one sided slave cyl..