I went to Kansas City last week to help mom clear out the attic of the home our family lived in for 43 years, I came across this radio, not sure what it came out of but my data card shows my SL was originally equipped with a Becker Grand Prix. This isn't the one I took out 30 years ago, that was a tube type Grand Prix L.M.U. The one I found is the Transistor LMKU with the larger DIN face plate but the small diameter knobs and chrome levers. I had kept the small face plate off the original radio because I didn't want to cut the hole out larger and installed a working Europa TR mono with the Grand Prix faceplate.
I found out when I got the radio home that changing the face plate of the G/P to the smaller style isnt just a bolt on conversion. the bolt centers are narrower on the larger faceplate style.
I attached it to a speaker and antenna and it does play and the "wonderbar" will scan across the dial and stop at the stronger stations, but I am in a rural area with weak FM reception.
It will look beter in the dash than the Sony CD player that my son calls "an anacronism".
I also found some old tube type radios out of Pontoon fender 220 sedans and a remote Becker Casette player. The casette player won't plug into my G/P It is made for a Europa II stereo. The casette door is also missing and the belt is broken, I thought the missing door would be the same as the one from a Mexico casette, But it is wider and a mirror opposite. I may just hide a amplifier under the Kinter seat and plug a MPIII player into it. Anyway it doesn't matter I gave all my casette tapes to the chruch rummage sale a couple of years ago.
