Yes, but I have only seen them as part of a full "engine" or "lamps" harness (~$200 Year One). Your year has 3 connectors, each w/ different "key". I think they stayed the same over the years. Forget the pigtail approach. That would be unprofessional and add problems. You just need the plastic housing, and make sure you know which one before going to the junkyard or buying on ebay then fussing at the seller. I know A-bodies are getting rare, but I recall seeing these same bulkheads on some 80-90's Dodge motorhomes and vans (some had 4 connectors).
The male terminals are easily removed. Search for photos of "56 terminal" (some here) to see how they release. If you first pry the black foam seal out you will see. Squeeze longitudinally at the bottom w/ needle-nose to compress the "latch" and wiggle it out, similar to removing a fish hook. Would be smart to sand each one bright and coat w/ silicone grease before you re-install. You can buy new terminals on ebay, if any are bad or the wire needs replacing. You can also remove the female terminals on the cabin side, using a thin flat screwdriver or such to push in the latch as you wiggle.
