Coil balance for Alliance window

A home owner from Michigan says:
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.
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Paul from SWISCO responded:

We do see that you ordered the S152-9 coil springs and we agree on your replacement selection. I also see that you are inquiring about your balance shoe. Our 15-177 should do the trick. Look it over and let us know if we can assist you with anything else.

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