I had my truck for years before I was told I had a front bumper on the rear. The PO had used heat to bend the rear brackets (which ARE different from the front) to fit the front bumper on the rear.
Don't use heat, you will make the bracket brittle and when you DO find a real rear bumper you will then have to locate another set of proper rear brackets.
If you're asking if a front bumper-bracket COMBINATION will work on the back, I am not sure but I doubt it for the frame spacing is wider in the rear, get the picture?
I've got to tell you only the more experienced 'bolter can even tell if you are using a front bumper on the rear if you can get one to fit.
Let me know if you want my old-made-to-fit-a-front-bumper-on-the-rear brackets. A piece broke off when i tried to use them to install my real rear bumper, will need to be welded back on.
Email me if interested, can send pictures to show you what you are getting into.
~ Cosmo
1949 Chevy Half Ton
Rocinante, like Don Quixote, he is awkward, past his prime, and engaged in a task beyond his capacities.
"...my good horse Rocinante, mine eternal and inseparable companion in all my journeys and courses." ...Don Quixote, Cervantes
"If you come to a fork in the road, take it."...Yogi Berra
"Rudeness is the weak man's imitation of strength." ...Eric Hoffer
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