It looks like #90-278 matches existing lock (see photo) however I don't seem to find a similar keeper. What do the experts think?
Bob from SWISCO responded:
June 2, 2020
I agree that the 90-278 looks right for the lock; just make sure the distance between the mounting holes and the back of the sash lock also match. For the keeper, see if our 90-301 could work as a replacement.