Sash Window Balance 2630

Hello, I have a sash window balance I need to replace. The metal part is 27" long and it has plastic white bits at the top and bottom. Has some kind of pulley mechanism. It says "2630" on the metal and in small print "B.S.I." and in even smaller print "RH" The images are of a "working" one. I have at least 3 that are broken. There's also a smaller plastic bit (pictured) that's attached to the sash itself on the side. This is the non-broken one. So I need 5 balances and I guess 2 of the smaller parts (the "Window5" photo). I'm trying to get these parts quickly. What is the balance called (part No. etc) and what are the white plastic bits on each end of it? What is the small part in the last photo? Can you put together an order for me of all 7 parts (5 balances and 2 small parts)? Thank you!

Thank you SO MUCH for the help!! I just now placed my order!! It was the S385-27 with the 1-3/32" shoe. And here is the Top Sash Guide that matched:

https://www.swisco.com/Top-Sash-Guide/pd/Top-Sash-Channel-Balance-Guides/18-008

Thank you!!!!!!