can these be found anyplace still for sale?
well yes/no
that one I bought off here in the classifieds, along with a Savage 110 LH short action base of all things. I think I paid $20 for it and another $20 for a gunsmith to d/t the two holes 2x56(??)
they show up on flea-bay, and of course in the misc boxes at gun shops. I don;t believe they have been a catalogue item for some time (70's??)
Good luck!