Wasn't the answer that I wanted. Lol
Last resort.
Wonder if one of the Chevrolet Master parts price list catalogs I see on Ebay would tell me.
One of these might. But, it will need to be an edition earlier than the oldest I have (1929-1942). That edition lists truck parts only back to 1934.
Beds for large trucks were often custom made. So the brackets pictured may have been as well.
