Hello everyone in the forum, i'm new here!

I am having a bit of trouble sourcing a wiring loom for a ZX-600 C1 which is basically the first lot of GPX 600 ninjas. I can't seem to find the main wiring loom anywhere, part number being: 26001-1865.

Reason I ask is because I have just bought this bike and a previous owner has installed a DIY switch for the cooler fan. Terrible job they have done with it too.
If I can't find a wiring loom in order to replace the bodged electrics, how can i go about this? would repairing the splices they have put into the loom and soldering back the old wires a good idea? They have spliced a wire into the live red wire on the main loom going up to the ignition and another wire into the earth of the wiring coming off the main loom connecting to the cooler fan connector box.

Thank you!