The pushers are incidental although if you're using a DSN case, you need to shorten the shanks. You also have to muck with the case clamps quite a bit, DSN does not have gen like mounting. The movement you're looking at has a screw and spring type mounting system that is not drilled through the main plate. In order to mount in a DSN case you need to either drill and tap the main plate or fabricate very thin L shaped clamps and then slightly mill the case back to fit.