I will sum it up for everybody: Those wheels are WAY to wide Those air shocks WILL eventually plunge thru your trunk floor.
I can testify to that. when i bought my car, the shock was still hanging in the floor board between trunk and back seat.
i bet on the 10" rims they will rub also... buy 2 of the right rims and tires and get the other 2 later... ......
you cant tell but i have the bracket reinforced with some welds. as for backspacing what should i get for the backs? 15x8 wheel but offset and backspacing?
All cars are little different, things get tweaked, people change rear ends, etc. For example, I have 15x8s but with 6" backspace. You know what you have now, using that as a guide, measure to see what will fit.
Welding the brackets will be of no benefit. It is the thin steel that the brackets are fastened (now welded) to.