I think its time to give in and buy a new wiring harness

I used the AA classic on the 67 barracuda and its all there. I did gut my ammeter and put in voltmeter innards. Also replaced with a one wire alt. If it were not a nut and bolt resto....Id just go without the bulkhead. Run through the firewall with a grommet/goober goo and be happy that i had fresh wires. I didnt know at the time of ordering that the bulkhead was a weak link and that it was for assembly ease only. I was looking to have a factory look, but looking back, not much looks factory anymore.

$0.02