The radio that came in new
Australian 1980s delivered cars was definitely a
Eurovox.
The EUROVOX MCC2358P radio (PORSCHE BADGED ON TAPE DOOR), pictured above, is correct for a late 80s Porsche.
Below is the Eurovox MCC-8280P that came in the very last of the G50s and the early 964 (interesting is the sticker in 2nd pic stating made in Japan) :
