For awhile my friend Erik (slcfj62 on ih8mud) was making a series of headlight harness upgrades for the wagons and I carried his stuff on my site while he still made them. He has since taken on a full-time job that is taking up all his time and has had to put making harness sets on hold.
You can drop him a line on ih8mud and see if he has a folder of people who are still interested, but I know that for the time being he just doesn’t have the time.
He put up a new thread on Mud to help with those that are interested in piecing together their own versions:
Sorry the products are no longer available here.