I did 1.25" front and 1.5" rear on mine. I still had to notch the back of the factory 20's for the 1.25", the 1.5" cleared just fine. My OEM 22's also cleared just fine. The wheel studs stick out about 1.375" and most wheels have a small divot on the back of the hub to clear but my 20's the divot was too small to even clear the 1/8" the studs stuck out past the spacer on the front.
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Knowing what I know now, I would order 1.5" all around if I were going to run my 20's with spacers year round, and if I was just going to run the 22's I would get 1.25" all around. Also my next set of wheels will be aftermarket with the correct offset so I don't need to run spacers at all.
When I took off my 22's and put them away for the winter and put my 20's back on, I also took off the spacers. I didn't want the salt and grime from winter roads in Cleveland to destroy the spacers.