L23FPorsche

I really would like to get rid of the last remnants of my HIFI option and replace the two-way speakers on the rear shelf to 4x6's. I purchased some real nice MB Q's about a year ago but ran into a problem when I realized I couldn't use the speaker grilles. Does anyone have a solution to fitting with different grilles. Also wondering if I used standard grilles if they would cover the indentations left by the old grilles.