Original Interlock Tru-Latch spring loaded Double Hung sash lock with two screw holes.
This cover and mechanism have been updated with newer styles without screw holes.

Replace with Current style

Related parts:
SK09-0001 Tru-Lock spring loaded sash lock mechanism
SK01-0010 Concealed Screws Cover
SK01-0006 Indicator Cover w/ red strip
SK04-0008 Slim Line Cover - Plastic
SK04-0012 Slim Line Cover - Zinc
SK04-0007 Soft Line Cover
SK04-0014 ADA Cover w/ String
Note:
Some covers have minimum quantity requirements and are special order