Dave,
Good idea. I spent a hour or so going through Steele's website, also looking for the rubber plugs for the hole in the back of the headlamp buckets. I found some channel that is close. With a picture of this nature I can send it to them. I think you have to buy 25', as you had mentioned. It will rot in the garage post me using three feet of it.. There was a gentleman selling the correct pattern lower grill for the '67 cars with outboard lamps, and I asked him about buying enough to do my grill, and he agree to it. I asked him to invoice me for it so I could pay him, and there was no reply. Perhaps he elected to keep his trade secret.
-Keith