de-pin a headlight socket

I replaced the red and black wire from the bulkhead connector and ran them out to the left headlight plug. The wires were so brittle that they would snap if bent. But I've decided to replace the rest of the harness with this.

https://www.amazon.com/gp/product/B00H5JFHR0/?tag=fabo03-20

The relays will take the load off of the headlight switch. I will splice this in and remove the plug.
Thanks for the replies everyone.