Thought I would test my theory on the bumper caps as well.
For some reason ( that someone here may be aware of ) - every Stern cap appears to be available as a repro except these 
Hey Wotto
I asked PBR about them around 18 months ago. They said they had 1 cap in stock, and no plans to do another run.
Interesting that your switches around the big flipper are red. Mine are white. However, I have seen both before, so figure was just a matter of what was in the parts bin at the time :)
