Sean,
I do have several of the mounted license frames, however they are on 1980-up longbeds.
They are original equipment and comprise two basic pieces: the upper part holds the two license lamps at an angle, has pressed stiffeners, and is bolted to the face of the rear crossmember; the lower or actual license frame part has several cutouts, pressed stiffeners, clearance holes for the hot rivets, and bolts-up at an angle to the underside of the rear crossmember.
I do not have an undamaged angle strap "stay" that keeps the license frame braced, but the parts manuals show it to be simple in design. BTW, the upper lamp part doesn't seem to show up in the parts books after a quick glance, maybe on another page?
If.......this all was the original and continuously-produced license frame set of parts, it could become a template for producing copies to also use on the older pickups. I haven't removed one and tried it under an earlier frame. On the later LHD pickup beds it was all mounted on the right rear--not sure if that was changed from the left side for the earlier trucks.
A problem with these license frames, and perhaps why so few have survived, is that the extra-long length of the bed and frame can come very close to the ground on a steep ascent and rip-off anything hanging back out there. The lamp-part is tucked up out of the way but not so the actual license plate.
Also, anyone adding a rear bumper, might likely block from view the license plate.
But... for the sake of originality it's nice to have. Additionally as started in this thread, I also have a loose set of the rear reflector plates from the earlier pickups--most trucks are missing them as they get mangled from use and abuse and setting the bed down without removing them beforehand.
If Kevin wants to repro this stuff I'm game to remove and ship off to him, as photos-only really requires a lot of measuring and guesstimating.
I'll be away till Thursday. Let me know if there is enuf interest, and if Kevin is willing to do it.
If I do unbolt stuff from a later truck, I have a '65 LPB frame back from powder I can sample fit, or try it on a '67 LPB if that helps. The parts books show what looks to be a slight variation in the middle-production period( 3/69 - 9/73) but only a few of those trucks have ever been brought-in to North America, and any internationally could probably adapt anyway.
Again, only if there's a genuine interest in some of this obscure stuff.
And sorry if this is boring talk--I just like some of the rare pieces, and the quest--always the quest ! Often makes me wonder, if the customer doesn't understand the special piece, appreciate it, or realize the time and energy spent acquiring it, should it be sold-off with the truck anyway, or saved and kept, or sold to a fellow rabid collector? And they say you can't take it with you to the grave. Oh yeah, look out, just watch me, driving my pickup thru them Pearly Gates, loaded down with all the s*** I've collected over a lifetime ! Whoops, maybe they won't validate my ticket if I cuss. Well it is easier driving downhill--it's just the heat................better stock up on extra coolant just in case.
HTH