Got a catalog from Steele Rubber Products. Item #70-0219-73 sure looks similar. I measured what I removed from the tailgate and the dimensions seem to match pretty close. Not sure if anyone else has tried this one yet.
Possible weatherstrip replacement
Moderator: TechMOGogy
Possible weatherstrip replacement
1973 712M
Todd, The problem is going to be the length on the middle piece it's just to short. I found one that was the same as the factory but it was just wider. I will post pic's tomorrow. It seals to back so tight I can fill the back with water and it doesn't drain until I open the back door. I post the model number some time back I'll see if I can find it.