Vertical window latches broke

Hello all,

I have a large slide with vertical sliding windows. On one of the windows the cheap, plastic internal latches/tabs that allow you to position the window in various positions broke and I'm not sure how to replace them. The window not only won't stay open without being propped, but without the tabs it also won't lock shut either.

Is there a way to replace them without removing and disassembling the entire window?

Thanks!