Duster Bumpers

Take a look at Desert Valley Auto Parts.
They're an all classic car yard out in Arizona, and they've got a good selection of stuff. dvap.com is their website and they do ship. You will need to find a shop to rechrome them though...
Also October 30 is the Fall Fling in Van Nuys, you may be able to find something there. info at cpwclub.com. I normally go but can't this time.
I think I may have seen your car out and about a time or two in the past over in Brea, I live in Colton and go to school in Pomona, but have a ton of friends I hang out with in Brea. Good to see someone else with a Mopar in the area.