Hi Mark.
I should have been clearer. I was not suggesting that you use washers to permanently mount the wheel. Only that you could simulate the effect of a spacer to observe the clearance.
The purpose of a spacer is to change the offset, so if a spacer solves your problem, then it is an offset issue. I suspect you have 12 offset wheels because 3/8" spacers will change that very close to 20.
https://tiresize.com/wheel-offset-calculator/
The original set up was 185-70-14 tires with 20 offset and zero spacers.
good luck
Peter
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