Anyone who purchased a rear light harness for a 67 Barracuda FB and needs the ad on harness that feeds the fuel sender and right side light call Darrin at M&H. He may try getting it added with the harness.
His number is
562-926-9552 ex 205
The right sub harness wasn't included in mine either. I am trying to get hold of M&H about it but their phones have been down. I received an email from them to keep trying so will call again and see what happens.