Top Sash Guide Pair, Pan Am

Hello I recently ordered window channels S377 to replace the ones which have failed in our home.....BTW they fit perfectly. Now I just realized that I need to order the attached photo. These plastic pieces screw into the top of the window and they prevent the window channel from travelling past the ... (cont.)

I think that I need part 18-042. Can you please confirm this? We have the new balances installed and just realized that one of the top guides is broken.

I need to replace both balance springs and the guides afixed to top of windows also I will need two replacement Pan Am Take Out Clips. thanks for your help Tom

Trying to replace some window balances. They are chanel balances for a non- title windlow and are 30 inch long and 5/8th wide. The stamp on the bottom front is "r 29-5". It is a block and tackle connector. The ends are winged. Which window balance should I buy?

I included a picture of what holds the spring down and the side of the channel. It seems to me made out of plastic and very brittle. Is this part removable and replaceable? And if so I would need a part for it.Also there is a plastic part on the window itself which seems broken. Hopefully these pict ... (cont.)