I think they are made to fit a certain size opening, shaft distances, and even shafts that are mounted higher than the center, etc.
Check out Crutchfield.com. They have a retro looking FM radio with Bluetooth and a USB port. Type in Ford Maverick and the year in the search function. It apparently has an adjustable faceplate. MD
I have also seen the digital radio that is supposed to fit the original housing. I think saw it for $200. I plan on building a bezzle to install a mondern radio until my restoration is closer to complete. That way I wont destroy the original. Currently my 73 has no radio or speakers. It was a long ride hoe when i bought it
Check out "AutoRestoMod" on YouTube. They have a couple of videos installing a retro system in a '68 Ford wagon. It's pretty cool.
If it's a full size Ford, the install will be totally different than any Maverick/Comet... IF it's a Fairlane/Torino then it'll be approx same...
'Sorry, I was referring more to the components themselves. I thought they were really cool. The install of the deck would certainly be different from a Maverick/Comet.