Find a parts car, Or the stuff you need will be an ongoing challenge. Any Duster or dart sport from 73-76. There are many that show up on this site and others as parts cars. Do a search on "Seachtempest.com" Rust buckets with no drivelines are out there from $500 - $1500 It would be worth for you to find one Take what you need and pass it on to recoup some of your money. I do it all the time with 70-72's.
I picked this one up for around $200 . I kept the Tuff wheel and column sold some parts and passed it on. The motor and trans are laying out back for future bolts and parts. Sold the drag link that I kept last week.