Broken Tilt Latch

We have Traco double-hung windows in our apartment which tilt inwards for cleaning and (not surprisingly) have a tilt latch on the top corners of the lower sash. The tilt latch is internal, with flanges located on the front of the window to pull the plunger inwards to release the latch. The latch mechanism uses a white plastic plunger which holds the window in place - and that white plastic plunger has broken on a number of our windows.

Do you by any chance have a replacement part that could be used to fix the window? I am pretty handy at fixing things and also have access to more skilled handymen, but I first need to find the correct part.

A photograph of the mechanism is attached, but - unfortunately - I can not find any number or other marking on the tilt mechanism or the window (other than a sticker saying Three Rivers Aluminum Company, Pittsburgh, PA). The window itself was manufactured by Traco in 1995 or 1996.

I know that this is not much information to work from, but appreciate any help that you can offer. Thanks!

-Charles