Bwana-Jim, Welcome to the Stovebolt. Not sure I can answer your question but I do know there were some "late" and "early" model changes in several years.
The Advance Sign or "AD" style was from 47-54 and grilles were mostly interchangeable. We have also found that many previous owners did a lot of different things to the trucks through the years.
.........Since this is the Welcome Centre not many technical questions get answered here so please note that to get the fastest and most information be sure to ask questions in the most appropriate garage forum.
Oh, and a picture would be worth a thousand words.
