Searching for stanley tilt window parts

These are, I believe Stanley tilt or awning style windows from the early 70's. I live in Palm Aire in Pompano Beach FL where they outfitted over 9,000 units with this style window. While many have been replaced, most are original. I would think there would be a demand for the small nylon keepers. The photo is of the mid window keeper, also needed are tops and bottoms. I hope you either have these or can direct me to a supplier.

Thanks, Brad