It's been about 18 years since I had those brakes on my truck. If I remember correctly the rears are narrower that the fronts, as are the brake shoes. Check this forum under the 48 to 60 area. Someone there should know for sure. http://www.ford-trucks.com/
My rear drums won't fit on the front of my '48. The fronts are deeper than the rears. Hope this helps.
They are different (deeper). I have a few extra axle laying around that the fronts and rears are the same.. it seems that the later trucks are this way 51-52. but my 48's and my the other 49's and 50's that I parted out were all deeper in the front.
Thanks for the info. The brake stuff I got came off a 52, I think. I'll go back and check the rears to see if they measure out the same.