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The upholstery patterns are different but all 1965-66 GM "B" body cars of same bodystyle use the same seat frames and structure. Same with body glass.
What this means is windshield and body
glass, seats and top frames for a 65-66 Impala, Pontiac Bonneville/Catalina or Buick Lesabre/Wildcat convertible will fit your Delta.
Taillight lenses and buckets can come from any 1966 88 of any bodystyle- Jetstar, Dynamic, Delta or Starfire. Jetstar, Dynamic and Delta use the same chrome bezels. Starfire bezels are different.
'65-'66 Impala convertible side window glass, wing windows, and perhaps even windshield should be the same. The quarter window and possibly regulator is different in H.T. versus Convertible, the rest is likely the same. And covered in the reproduction market.
I also should have a bench seat front that would work. It was in my 66 Delta conv and came from a 1967 full size Pontiac. I should also have a 66 Delta conv. rear seat frame top and bottom, would need to check on these as its been so many years gone by....