72 Turn Signal Housing Wiring Short Question

[lintcollector]

OK, so my daughter and her "non-boyfriend" swapped the grille and bumper from the borrowed '70 to the newly acquired '72 parts.

We found that the turn signal had a short, so we removed it from the bumper. The short appears to be at the neck of the wiring boot and metal shank (green in pic).

I have searched online and on the forum and can only find how to repair/fix TS wiring harnesses or the TS switch in the steering column.

I've tried to twist the metal shank (brown on pic) and the little tab and the little tab (yellow arrow) on the front keeps it from turning.

Can anyone tell me how to get the wiring free from the housing?
If I bend out the little tab can I twist it and it'll come free?
I'd rather buy wiring and not the housing if possible...

I've attached the two below pics, with color coding referenced above.

Thanks in advance!