I do still intend to run duals in the back. Might have to see if I can find a machine shop in the area, different wheels may not be a viable option. It took me almost a year to find the 19.5's that I did, don't seem to be many in this area.
I have found hub centric spacers which have a 116.7 mm bor which converts to 4.59" (and change)...I am assuming that will not work, correct? My understanding is that 4.56" needs to be exact.