I hate electrical

By the mid-1980's, I think all manufacturers gave up on bulkhead connectors and just ran the thick wire bundles straight thru a bulkhead hole. The wiring had grown so much that a connector was impractical. Makes a rewiring job tougher. My 1985 M-B is somewhat in-between. All the 12 VDC supply wires pass thru a fuse box which sits in the the firewall, so sort of a bulkhead connector.