Yes, the rubber hides the imperfect fit, but also protects the paint against the sharp metal edges of the bumper.
Regarding placement of the front pre-L bumpers, they should be flush with the ground, thats also the only angle in which they will fit the body reasonably
I looked at many cars before daring re-drilling holes for mine.
The upper inner edge of the bumper should meet the inner corner of the fender and the lower outer edge of the bumper should approx align with the outer line on the fender.
At least, that was my conclusion and how I ended up mounting mine.
Kristian
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