No luck finding an adapter or retainer (did find a board). Sorry. But to answer your question, mine is a 105 Componon. I didn't realize that it is on a nice threaded board for my Durst enlarger now. I have two lens about that focal length, so figured one was a spare, but they are mounted on different enlargers so I guess it makes sense to keep them both for the occasional situations where I need the focal length.
Sorry for the false positive. Good luck with your quest.