R. and L window sash mechanisms. Also, broken locking tab.

Hello! Your balance looks like a match for our Series 395. This has a 19-005 top and 15-001 bottom plastic fitting, so as long as these match up then I feel confident that this will work for you.

As for the plastic pieces that attached to the window frame, it sounds like you might be referring to the top sash guides. I'll need to see one removed from the window and in undamaged condition before I can suggest a replacement. Would that be possible? If so, please show me a clear picture of the front and one of the side. Think of it like a mug shot. I can then check our inventory for something that matches its profile.

Yep, that's the top sash guide alright. At first glance this appears to match our 18-015. Your next step is to carefully compare the dimensions we show for this part to your original piece. That will allow you to confirm whether or not it's a good fit.

Alternate view of 18-015

Alternate view of 18-015

Great! All orders can be placed on our site at your convenience. I've linked to the store page for each respective part in my responses above.