Another newbie
Don't know if this helps, but I just did a quick search on google for 1972 Duster Parts.
This ad came up
http://www.oldride.com/parts/1025089110.html
At least by the picture there is a fender there. Don't see the bumper, but then who knows it might be somewhere. Not sure how the site works or about working a deal on it with anyone as I've not seen the site before, but maybe it is a start.
LA craigslist has a chap with a '72 duster he is parting. Can't get the link to work as using craigslist helper, but it is in the LA craiglist, antelope valley, auto parts. Says you can call 661-722-1893. Big parts he says are $50 up. Says he is in Lancaster area.
Ha! See your ad for a fender in Monterey!
Hope that helps.
Yes, Monterey is really wonderful. Nothing like having to wait to back out of the drive for a huge Deer to take its time walking across behind you. Much better for us though where we are. The damp climate was really getting to the health issues. Nice and dry here so much easier for us. Still go back every year or so when we can. Miss our Paris Bakery. Mate of ours says our pub closed (London Bridge down by the water). Anyway, best of luck and hope you find the parts.
Cheers