CS6365C (black / white) or CS6365L (all black with 2 screws to hold the backshell to the plug body) ?
I just grabbed a CS6365C here and its box lugs are copper not AL, furthermore the terminals are captive in a permanent assembly.
Edit, I looked at a CS6365L and it has aluminum lugs and looks like it can be disassembled with a couple screws.
I doubt hubbell will sell those (or even has them -this connector is made in china) as a separate part. Years ago they wouldn't sell us just the backshell for 5-15 straight blade plugs.
I checked a couple lug manufacturers and the V bottom ones don't seem to be available as they don't really have any application outside of connector and terminal block internals.
How many damaged connectors do you have? Are all the lugs damaged on each? Maybe you can make 1 good one out of 2 bad ones or something.
tl;dr -internal connector parts not replaceable, the plugs are worn out replace them.