Factory terminals to re-pin connectors?

Yes, search for "56 terminal" or "Packard 56", used on GM & Mopar in 60-70's. BTW, Packard was an electrical supplier, not the car brand. You can buy basic plastic housings up to ~8 terminals on ebay, but many in our cars are Mopar-specific: ex. headlamp, key, and wiper connectors. Next time at the junkyard check 80-90's Dodge motorhomes and Ram vans. I was surprised to see many 1960's connectors on those, either because they were less often redesigned or a way to use up old stock. You also find the same or similar terminals in many home appliances. I used many of the female terminals in the top photo of post #2, but don't recall which Mopar housings I did so. But, the gold-plated ones below are more factory and spiffy.

In some cases, my Mopar terminals were fine, but I was adding a relay (ex. for ACC power from key switch) so I released the factory terminal, installed a new wired terminal in that position to the relay coil and connected the factory wire to the relay output. To release them, you can use a small flat screwdriver, but I bought the $8 Delphi tool which works better (no beveled end, perfect width). To release the male terminals, squeeze longitudinally at the bottom (top photo of post 2 makes it obvious).

The round dash connector was fine in my cars. The plastic holder didn't appear brittle. The round female pins slide out if you need to clean them or press tighter. The round male pins on the circuit board often get "cold solder" cracks, but easy to reflow them w/ a soldering iron if your cluster is out.