Like 74_Coach, I am also looking for a source for the little spring loaded double roller.
For the car guys, a little trivia about Bob Burkitt. Prior to being involved in GMC motorhomes, Bob Burkitt was a champion drag racer. He had a 1962 Dodge Station Wagon named "Behemoth". Among his many wins included winning Stock Eliminator at both the U. S. Nationals in Indy and the World Finals in Dallas in 1969.
Here are photos showing the interior and exterior setup on our 1973. I removed trim pieces in the first two photos for clarity. The final photo (open door) shows the black strike plate before I glued the rubber bump stop to it and my temporary solution for keeping the bugs out in that area.I looked at my setup yesterday and it’s slightly different to photos posted by folks in this thread in the area where the two vertical trim pieces butt up against the rubber retainer and where the roller assemblies are located. The metal plate the rubber retainer affixes to that sits behind the large strike plate with four recessed Philips head bolts, is much further back on our 1973 than in photos and the schematic. The two end tongues (grooved in the back) do not reach the metal guide rail the plastic trim sits on in the door coach door entrance frame. It doesn’t create a continuous and seamless barrier as seen in images elsewhere in this thread. I’ll post a video showing the screen door, surrounding trim, and where the trim interfaces with the screen door roller assemblies in our 1973 as soon as I can get to it.
Btw, the only changes I’ve made over to the screen door over the years are cosmetic in nature, plus adding the (missing) trim pieces from Bob Burkitt, replacing the two roller assemblies, and installing the rubber retainer bump stop purchased from @Jim Kanomata recently. Since the setup is working for me and — even though it’s not the cleanest — I’m leaving everything as is.
I'm going to be employing some of the tips mentioned in the instructions (posting the final cleaned-up version tomorrow).