WINDOW WONT CATCH BOTH SIDES OF CHANNEL BALANCE 2630

Note that that stamp code only refers to the spring strength of the balance, not its identity. It is the nylon fittings on either end of a non-tilt window channel balance that determine what you need. Make sure your replacement matches the original balances in this regard. Otherwise, if you believe you need new Top Sash Guides, see if the 18-009 or 18-166 match up to start.