I have an original Blaupunkt Mannheim radio in my 1969 Beetle and it runs with the original speaker. I also ordered a new speaker from retro sound, which is great, but I was too lazy to install it.
I put also a special Blaupunkt DIN cable connector in the rear of the radio which makes it possible to connect two more thinks like a MP3 connector with ACR 900 player.
The first picture shows my 1969 VW 1500 Beetle with Blaupunkt Mannheim MU, all original and untouched. The radio was made about 1970. I changed the radio because it did not work and it had not the DIN connector. The DIN connector is useful for mobile connection.