The only problem with running those sorts of widths on the fronts on a gtt is the lack of guard. I had 9.5+22, and I had to remove the front liners for scrapage problems - and they sat completely flush with the guards. Now the issue here is, with a wider tyre, and non mexican spec, you will need a large offset, which you can't do as it will eat your suspension. I can't remember how much clearance I had with mine on, but I don't think there is much room for movement.
To get 10.5 to fit up front you will need something like +10 offset, 245/40 or less tyres, pumping guards, big camber, etc. Cause it will look mexican as fark with no camber.
Rears are 10.5+22 with natural camber and they sit nicely on the guard.