1968 Coronet 500 Rear Tail Light Connectors

[68Coronet500!]

I appear to have an issue with my tail light connectors and am stuck. It is clear that if I jiggle the wires into my right rear tail light, it will come on however I can't do the same for the left light which leads me to believe that the connectors are bad.

I'd prefer not to replace the entire harness, any ideas?

The car is a 68 Coronet500 convertible.