OK, I had to go & crawl my fatass under my ~Z~ with will turned to lock left.
pending mine is a base model with +43 8" front wheels.
my wheel backspacing is 6.21" & when i measure 1" above the rim lip (imitating a 20" wheel) i easily have 1" of space...probably closer to 30mm.
Therefore/ upon my personal findings...i would be willing to say that you can go up to a +40 offset 10.5" wheel,,,that would be 7.333" backspacing & 4.167" front spacing.
Not sure what you have now...but tire maker will definitely play a huge role in this.
"Safe-Mode" would probably be between +32 & +38; you may have nailed it with +35?
curious to see your outcome,,,,would be cool to have some test fit wheels.
Be sure & show off what you decide.
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