I have noticed....alot of emblems are held on with a rubber/plastic sleeve over the pins, but some I have seen have metal push on clips....dunno, just wanted to point that out.
I have a 1974 Duster as well....and all the emblems, need to go back on
I found OEM clips on a 65/67 dodge coronet/polara. Nice factory clips that fit the "newer" 70's emblem studs perfectly. They have a small hex-head so easy to gently tighten with 1/4 drive tools.