Project Frog Princess

I'm at 44" to to the outsides of the backing plate flanges. Housing end to end is 46 1/4". Adding 4" of backspace would put you at 50 1/4".
This setup gives me 1 1/4" from tire to frame rail, and with the diff near frame bump stops will give about 1" to the outer fender well where it curves in. I assume you will have to trim that area out for your setup.

Are you using an 8.8? If not of course these numbers will not apply. We'd have to use mounting surface numbers, which for me is 49.5"