It took some hard looking but I ended up getting the rag joint that I wanted after receiving the two that were nothing like what the suppliers had pictured on their websites.
You can see in the earlier pictures I posted what I had wanted and then what I had ended up getting.....twice!
I started looking around on Ebay and saw a few sellers advertising the power steering RG I wanted and using the picture of what I wanted. They all said they were OER part# 7828871. One of them listed a phone number you could call with questions. This was Ebay trading name STMCSS396. They have a physical store called South Texas Muscle and Classics. I called and got a guy who was working alone, trying to handle a bunch of phone calls, and a little stressed out. I told him what happened twice before and said I won't buy another one of these till someone actually pulls one off the shelf and tells me it matches the advertised picture. Despite being very busy, he was nice enough to do that, confirmed that it matched, and that's exactly what he sent me!
This RG is not 100% factory correct but it's 90 or 95%. It has the four ply reinforced rubber disc. It has the correct diamter shouldered bolts like the original. One 5/16 dia. and one 3/8 dia. The 5/16 bolt had the correct copper plated finish. The two studs that are opposite of the bolts are actually riveted like the original. On the two RG's I had received previously, they were threaded into the housing. One of the plies of the rubber disc has the wire mesh embedded in which I believe is for horn grounding. (Correct me if I'm wrong on that.) The one noticeable difference between this rag joint and an original is the round bolt head extensions on this one. I'm not sure the purpose of that but I can live with it.
Interestingly, the first two RG's I received were in a plain brown cardboard box with OER stickers (third pic). This one came in a nice box with all of the OER graphics on it (fourth pic). Maybe the first two RG's are more current where they're using a generic RG and plain boxes to cut costs and the RG I just received is an older one made before cost cutting measures. I don't know......just a thought.
Anyhow, I'm happy with what I got.
Dave