I've read mixed reviews on Retro Sounds units primarily that they don't have enough output in watts to give a decent sound on modern speakers. It seems that they fit well and for the most part look original but if something sounds like crap is it really worth the installation. Another complaint centered around USB and other inputs not being up front for easy accessibility. One poster on another site said he had to invest in an separate amp powered by one of Retro Sound's units to get clarity through the four speakers he installed. Hidden Audio is pretty much the same for power output but at least you get a remote so you can keep your eyes on the road when changing channels and the like. I ended up installing a removable sleeve with a Pioneer unit and left the OE radio in place. It too has a simple remote and all the up-front goodies. It actually shifts modes when my cell rings and the voice comes out of the speakers hands-free. It easily powers 5 OE style speakers that are upgraded to 200Watts apiece and all speakers mount in their original spots without modifications. Beautiful sound in the 20-25 Hz range and I can easily over power my TTI exhaust system. When needed I just slide the radio out and take it indoors. Each to his own when it comes to auto audio sound.
I have their speaker in the front of a 67 charger its a pretty nice piece.
They also did an conversion on the factory radio but I haven't installed it so not sure how it sounds.
Looks good tho and nice people to deal with so far
r c, try this site,mikehagenantiqueautoradio.com,scroll to page 7 and you will see mopar radios.