Thanks for the replies. I am positive the rear end is out of an 04. From wms to wms measures 61.625 inches. I found a modern magnum 500 rim that is marketed to the 05 and up guys with the perfect backspacing that I am considering. See here if interested:
http://www.americanmuscle.com/05-magnum-18x10.html?utm_content=05-magnum-18x10&utm_campaign=FROOG&utm_source=Google&utm_medium=Shopping
Yesterday I mocked up a backspace/offset tool out of some old aluminum stock and some wire to test out the measurements/backspace and tire section width, and it appears as though it will work out nicely.
When I got the rear end under the car and on the spring perches, I mounted the 17 x 10.5's from my 03, and they looked really goofy (I knew they would, I am just really anxious to see the car on the ground with some nice rolling stock after being a shell for so long). :001_smile: