I don't have my project complete just yet, so pix will come, but.
MB Quart RUA 213 components: 5.25" in factory kick panels, 1" metal dome tweeter retro'd into OE prem door tweeters. Crossovers hidden behind carpet / panels. Rear OE premium enclosures with MB Quart components retro'd. Rear crossovers hidden under speaker tray. This provides a stellar upgrade over factory sound, premium or not.
My car did not come with premium sound, I just used the factory wiring through the front door gromits to the door tweeters.
Powered now by Eclipse 5441 CD (13wx4), being swapped out for a newer unit with a USB port, will add MB Quart RUA amp and possible 10"/12" sealed Phoenix Gold sub/amp for the future!