Depending on the vehicle and its age there may be a plethora or a paucity of parts available. There are companies that specialize in 55 - 57 Chevy parts, the same is true for first and 2nd gen Mustangs. There are also companies that carry parts for certain old pickups. Then there is always ebay or the junkyard. Social media has made finding parts for older vehicles a bit easier (note all the Facebook vehicle groups) but it does not make them any less expensive.
I loved the 1958 Buick Special. My girlfriend and me used to sit in the back seat when we went to the drive-in movies.
In the late 50's I think you could get it in upper end GM products like Buicks and Cadillacs. It looks like the car in your pic might also have the under the glove box tissue holder.
Highway Hi-Fi. Option in all Chrysler products from 1956 to 1959. Chrysler brought it back in 1961 with an RCA unit that played 14 45s. It was also sold by Sears as an Allstate.
That's a 1957 Chrysler Imperial. Read the tag on the glove box. These cars were so indestructible they were banned from demolition derbies.
In 1975 I bought about 12 front row seats to see Led Zeppelin at Market Square Arena. It was their first rock show. It might have been their first event. The place was new. My friends and me went down there in a 1967 Oldsmobile Delta 88. It was a Chick Magnate!