Replacement connectors:
www.vintageconnections.comI don't know if all you would have to do is to remove each "pin" from the connector housing, and place them back into the new housing, one at a time.
If you have to replace the connector on the wire, make sure you get the right size. Todays standard is a 4mm bullet, Honda MC was a 3.5mm, what size is the Valk I don't know.
I think some dielectric grease and maybe a zip strap to hold the 2 housings together, will keep it functional.
The IS rear wires have 3 sections. (a little self plug) I think I still have them all, from the main, to the rear lights (part listed $5), and to the trunk (I'm keeping the trunk for now).