A contractor from Brownsburg, IN says:
May 16, 2016
Marvin Window single lock at bottom to keeper at top and bottom. Which keeper would fit this lock?
Dave from SWISCO responded:
May 18, 2016
It's hard to be sure. Do you have your old keeper on hand? If not on this window, on an identical window elsewhere in the house? If so, I'd like to see a picture of it, along with dimensions. Thanks!