Slant crankshaft damper and pulleys
Inside it looked like factory AC, part of the heater box and in dash AC vents.
Same with my '89 D100, and I know that was dealer air because I bought the install kit NOS from a dealer's attic and put it in the non-A/C truck! By the late '70s, dealer air differed from factory air only in minor details. You could still get the lower-cost add-on under-dash types completely separate from the heater, but they were less popular than in the '60s.
A little tough to tell from where I'm sitting, but that looks more like a Nippondenso C171 compressor and clutch than a Sanden/Sankyo SD.
I don't recall having a memory problem
HAH! :-)
Y'think that's bad? Try this: a couple years ago I got a call my new eyeglasses were ready. Drove across town, parked in the underground parkade of the building where some friends of ours live (so they gave us a visitor pass...free parking downtown). Rooted around in the glovebox, found the visitor parking pass, put it on the dashboard. Put the club lock on the steering wheel, hit the power lock button, verified the visitor parking pass was visible thru the windshield, went to get my glasses.
Got my glasses, had some lunch. A few hours later, I walked back to the building, down to the parkade, and as I approached the car I saw both LH doors were open. Aw, nuts: break-in? No, nothing broken or damaged or missing. Dome light warm. I'd locked the doors, but walked off without closing them.
A fiftysomething friend's reply to this: "Welcome; we've been expecting you."
