I'm curious on this as well. "Matching plastic trim piece" usually gets translated into "a flat semi-matte textured piece of plastic with a double din hole through the center". The E53 is too old for the major audio companies to invest in R&D for tailored trim kits....a la alpine's "perfect fit"...unless the shop doing the installation is going to build you a custom piece.

Also as far as steering wheel controls...as with most headunits, it has the capability for the function, but requires an additional (PAC) module to actually use them.

Looking forward to pics of the install though!

__________________