Damned bulkhead connectors.

Dodge motorhomes appear to have used the same or similar bulkhead connectors (and others) into the 1980's & 90's. They aren't picked much in the yards. I used an interior fuse box from one, which was identical other than a few labels. The 1963 & 1965 bulkheads don't have the melting problem since they have dedicated lugs for the big ALT & BAT wires. But 1965 only works for early cars since a 3rd connector for the wiper was added in 1966 or 1967.

Most cars I have seen since the 1990's run the wires straight thru the bulkhead w/o a connector. They just got too many wires to make connectors cost-effective. The connectors were probably used to speed factory assembly, not for easier maintenance though that is a side effect, and a mixed blessing.