Cannot adjust shower doors to align correctly because shower walls aren't plumb... the shower bypass doors/rails etc are level and plumb but they leave gaps because the wall of the shower isn't plumb... any way to correct that enough to align the doors? Out of plumb appx 1/8 " on both sides.

Also forgot to add... this is a shower/tub insert... any way to adjust/shim the walls at the top of the shower walls to bring them into plumb so the bypass doors line up?