I just installed a Retrosound Hermosa head unit in my 1970 Giulia Super. It was a straightforward installation. I chose to rehabilitate and utilize the car's original faceplate, and it fit the Retrosound head unit perfectly.
There is a"screen protector" on the radio screen - this makes the radio look vintage. However, it obscures the screen, and I will probably only use it when the car is in a car show.
I also installed a Retrosound 5 x 7 inch speaker (2 tweeters, one woofer) in the original dash location, since I did not want to cut the doors or kick panels for speakers.
Finally, I mounted a Retrosound remote USB and phone plug input to the floor of the glove box, above the package shelf for attachment of an MP3 player or zip drive filed with music.
(The blue masking tape is there to hold a rubber dust cover out of the way for the photo.)
There is also a microphone for the Bluetooth, but I didn't connect it.
Sound quality is quite good with the new speaker. USB connection works perfectly. FM reception is decent with a simple wire antenna beneath the air vent grille. I have not yet tried AM radio.
Recommendations: Pricey, but works well, fits in the stock position, and looks proper in the car.