Replacement part Tilt Latch spring loaded Pat.#5,139,291 K 75 Vinyl
A landlord from Toronto says:
May 25, 2015
I am trying to find the replacement parts for my vinyl tilt windows. It is the spring latch. See Picture above. It is 2 5/8" in length and 11/16" wide, it has a round edge on the back and is unlike the ones I have found online. It has grooves on the side so that it can slide back into place.
Paul from SWISCO responded:
May 27, 2015
Don't worry so much about the rounded back. Most latches in this style have a round base, like our 26-243 and 26-244, for example. The only difference is the top cover of yours is round while ours is square. This detail, however, does not influence how the latch installs or functions. See if the two latches I mentioned can work for you.