i does ground some times when you got 5 in the car but i have nether hit the sump on mine and its 40 mm on 15" just get the right offset wheels mate and do change the shocks if you can affored it dude
use mk 3 astra mate thats what i got they look like they dont fit but the look ok with the mirrors on there as they hide the gap underneth two of the screw holes line up so there prety close mate
i just cleaned them and sprayed the tint spray on they come out good. mate how did you do yours. the front looks good as they look part of the glanza headlights now as they have a black edge to them