Back to crazecars original post. I consider myself a purist, but adding the Retrosound stereo requires no hacking, cutting drilling. My car had an AM only radio. I put in the Retrosound as well and other than the fact it is digital not analog it fits and looks natural.
With the Polk 4x6 kick panel speakers with original style grill covers even as a purist I had no reservations.
I even swapped out the mono dash speaker with a DVC from Retrosound. Same thing, no hacking, cutting or drilling.