41 is a one year only, but you knew that.
I'd call the usual classic yards and check price, condition and availability. Watch out for "NOS" crap. There were some really bad crash parts made back then that nobody even bothered hanging. That's why they are still unused.

http://www.mooresautosalvage.com/parts.asp?division=2&make=Plymouth

http://www.restored-classic.com/plymouth-parts/1941.html

Of course you can try the bag, and Hemmings.