BFS Side-Load Sliding Windows

I need to identify a couple of plastic spacers located near the bottom of the lower sliding sash. These appear to be lower guides for the channel balances and should reduce/eliminate vibration of the lower sash when installed and closed. I have attached several photos. The plastic parts are screwed into the side frames of the sash. Please provide a part number and a location where I can find these parts on your website.

It looks like this part (06-029 Keller Slider Guide) should work and be a very close fit dimensionally to parts that have broken on my BFS Side-Load Single Hung Windows. I'm anxious to get them and find out, but will wait until Swisco gets some 28" Series 395 / 2740 channel balances back in stock before ordering. Thanks to you and Steve Rakoczy for your perseverance in locating a part to resolve my problem.

I am looking for the Keller slider guide like the one in the photo.

Additional info. The photos show exactly how my Keller windows slider guide looks. The photos also shows the slot in the window where they are assembled in the sliding part of the windows. I hope you have them or can make them.