hi Mtneermik,
i don't do it for a living, but I have rebuilt the first generation radio 986067 for myself using as many original parts as possible (the old sugary filled electrolytic are rarely good).
your radio is probably the slightly updated 986443
they are 99% the same circuit
Chevrolet truck radio
1947-48-49-50 = 986067
1951-52-53 = 986443
both are interchangeable fit and if you ordered a radio in the later days for an earlier truck you would have received the newer model anyway.
... and when looking for parts, keep in mind that the Chevy radios appear to be nearly identical to the GM radios with dial faces that read GMC instead of Chevrolet.
GMC had different model numbers
example, 2233029 (but i'm not sure which specific years, but the radio looks like the 986067 two piece shell.)
i'm private message you links to documents
let me know if you have follow up questions
good luck
-s
