Window channel balance

If the metal channel is 24" long, not including the nylon fittings, and if the nylon fittings match the 19-005 and 15-004, then this an S385-24. Now, your stamp code is from an older rating system we do not use. To know what stamp option to select, obtain the exact weight of the window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the shop page.