This sale is for one excellent condition Bronica ETR prism bottom cover, suitable for use with the Bronica ETR / ETRS / ETRSi prisms and WLF only. Plenty available at time of listing.
The prism bottom cover protects the prism if you take it off to fit a WLF or similar. This cover has some very minor marks but is not deformed at all. Try finding another one – these are almost impossible to find.