Depends on what year..On My 94 and up to 98. the bed are all the same from fackory all they do is bolt on the fenders and cut a huge hole for the fill spout,(but you'll have to change the bed) And to put stock wheels back on all you do is remove wheels and Adaptors, you have to get lug nuts for single wheels also (one's with the tapper on them)
you will either need to change the rear end or put some spacers on to accomadate regular wheels, a dually rear end is narower than a single wheel one. the front will also need some changes, i think it's as simple as taking off the spacers, and of corse the bed, if you would drive to southern ILL i have a W250 that i want to make a dually out of, we can swap parts.
But i will have to say your parts need to be nice because mine are.
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