[RichardJ]

Bulkhead is another name for firewall.
Your arrow is pointing to the bulkhead Connector, but most of what you see is the engine harness plug and headlight harness plug that are plugged into the bulkhead connector.
The bulkhead connector is part of the dash harness and includes the fuse block. I think that is the only way I have seen them sold and many include an aftermarket fuse block.

Image from the forum electrical section shows the bulkhead connector and fuse panel sans the wiring.

That giant hole next to the connector would cause me more concern.