[morzh]

Chassis with Mershons caps are not that rare. I recently girt one from Kutztown that was pretty much junked.
You can rebuild them as usual aluminum can caps.
There are articles, some of them here from people who rebuilt them.
They are of course eye candies when cleaned and polished. Some folks install them in chassis that never had any aluminum cans or have them in totally different place, just to put them in for looks.