Is it getting old yet?? (Will it fit…again)

I'm no expert but your 4.5" backspace is the magic number for a stock rear and front. A 6" backspace with +38mm (1.5") offset should equal a 4.5" backspace if my memory serves me correctly. You may not even need the 1/2" spacer.
Again, no expert but you're in the right ballpark with that I believe.