Below, from left to right, are the shoulder "bars", shoulder buttons and under shoulder details.
Below, this is how they all look like mounted on the shoulder. Kudos to Ryan for producing these!
Another new arrival comes from Jerry C. These are metal backplates to the Utility Arm Carrier (UAC). I bought one for each droid. They are painted black so they do not stand out behind the utility arms.
Finally, here's how they look bolted into the back of the UAC...
I have to pick up some more 4-40 machine screws to mount these pieces into the R2's. But its nice to see some progress after several months off.