Compared to the stock 18" wheels, the backspacing of a 10.5et22 will be ~0.7" closer to the F strut (wheel only...tire sidewall will increase the backspacing, decrease clearance). I do not know if the GC threaded sleeve and lower spring seat/collars reduce the clearance between the stock F strut and tire/wheel?
I'm running a 9.5et23 with a 255 tire (had clearance issues with my old suspension setup) and I have plenty of clearance - ~0.3-0.4". I'll try to measure the actual clearance later today.
Even if the 10.5et22 does fit, don't be surprised if you get slight rubbing on the inner fender liner when the front wheels are turned.