Unfortunately ; if memory serves ; 1980 was about the last year of the small rectangular quad headlights from Chrysler / Dodge , so any you find in a wrecking yard will be 40+ years old .
I don't know if the aftermarket parts ( restoration ) cover Dodge as well as they do Chev and Ford ; but they might be worth a look .
Also I don't believe that the bucket ( mount shell ) you're after is unique to the van chassis so widen your search to include pick ups of the same vintage.
My 79 Dodge PU had the quad light system too.