I have one set of these custom eyepiece holders for the AP/Baader binoviewer (not the latest version). They perform two functions. Firsly they accommodate long barreled eyepieces (e.g. some Radians) by preventing them from hitting the prism. Secondly they allow for individual eyepiece focusing like binoculars. I bought them from Richard Lapides when they were being manufactured but have since determined that I don't need them. They have never been installed and come with all the necessary screws, tools and detailed installation instructions. (Richard did a fabulous job!)
These were custom manufactured and professionally machined and are not readily available. I paid $450 but will sell for $350 USD shipped to your door in ConUS and Canada. Money order or PayPal only please.
Thanks for looking!