I have been looking at the Champion radiators (Monster cooling) that are sold on ebay. There are several stores that carry the Champion brand. How are they in regards to quality and performance? I have a gmc and have contacted one of the vendors in regards to the manufacturing of a bolt in option for the AD series GMC. It is anticipated that Champion will produce one in about 6 months( hopefully). If the quality is there then this is a great option and is very reasonably priced. I have not been looking for a 1939 but if you contact one of the vendors they will check with the manufacturer. Ledfoot racing was the store I contacted and they were very friendly and helpful. Good luck and let us know what you find out and/or eventually use.