One channel balance that appears to be newer is made of galvanized metal instead of aluminum is marked 2830 BSI, RL

Good morning! I hope I can help you with this hardware. It's not a typical balance, but I believe we can custom make something that matches. I'm going to email you a custom order link and price quote that you can use to place an order on our website. Please let us know if you have any questions!
As for the top sash guide, I don't think it's available anymore. Could you substitute with our 18-161?