Martin On my plunger bike the stand stops are the cutouts on the underside of the silencers. I'm thinking your bike has a good mix of non standard parts, and your stand stop does the job well, as an add on. It is not an original fitting. Proper silencers are the same both sides, and have cutouts to clear the stand footpads (almost). Mine has wear and the bike comes off the stand with a clang, as the stand hits the silencers unless I am quick enough to catch the stand extension with my boot.
The design and position of the stand spring pulls the stand to lie flat and horizontal against the frame/footrest member. There is no other stop apart from the stand, frame and silencers.
Wear in the stand, frame eyes and pivot pins all contribute to the stand not ending up where it should be, swinging up slightly higher than designed, to contact the underside of the silencers.
Swarfy