Window parts

This looks like an S350-27 Channel Balance to me. Look it over to see if you concur. For a new stamp option, choose 2630. All costs are listed on the shop pages, and a selection of shipping options are listed when you put in your zip code at checkout. Let me know if you have further inquiries. 

The shoe and top fitting come attached to the balance, so the balance is ready to install out-of-the-box. The Top Sash Guides are nylon pieces in the top corners of the window sash that hold the balances in place during window operation. If yours are undamaged, there's no need to replace them. 

Watch the video below that shows how to remove and replace channel balances like yours.