Just a quick thought, but you could gut the inside, install modern electronics and then freshen up the outside. Then have a more modern radio but keep the original outside look. There are a few on E-bay. They look pretty neat.
~ Phillip 1949 GMC Suburban - 10 year project 1952 Pontiac Chieftain Convertible straight 8 hydramatic 1945 GMC half ton truck - Driver- Sold 9-15-25 1946 Chevy COE - SOLD 1-5-26 BUH BYE CHEVY! 1959 GMC Half ton long bed NAPCO