Coil balance for Alliance window

I have an RBS Performance Plus window made by Alliance that has a broken coil balance. The coil is 1/2 inch wide and has what I believe is a "9" stamped on it (see photo). Not sure if it's a "9" or "6" - depends on how you orient the coil. The number matches the orientation of your 9 lb Series 152 Coil Balance - just want to make sure this is the correct coil before I order a pair. This is a large (39-inch wide x 52-inch tall) window if that helps.