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My guess is min 10mm if it's hitting now. So your wheel bolts need to be 10mm longer as well.
I like my 25mm option, "DSX" bolt on, then standard wheel bolts. But couldn't source those last time I bought.
So got 25mm with long wheel bolts to suit. I run 25mm front and rear. 25mm rear is great. 25mm front is a bit funky steering wise. Such a wide stance.
10.5 is a wider wheel than I've ever used.
Check spacer documents - You need 6 turns before the bolts seat for safety. Also too deep is not good either as it bottoms out and locks up the wheel
Also that is a lot of ponies to be driving through such thin sidewalls unless you are doing this for posing.