Replacing balance shoes and spiral rods with Block and Tackle style.

A home owner from Grand Blanc, MI says:
I am in the process of moving from spiral balances to block and tackle style balances using the 770 series balance. I ordered a few parts to make sure everything would work before placing my full order. The 770 series balances are working great as a replacement for the spiral balances. I originally ordered the 15-129 balance shoes which fit perfectly except the cams are not deep enough.

I think I need the 15-121 balance shoe but it could be 15-118. I am ready to place my full order and just want to make sure I am ordering the correct parts.

User submitted photos of a pivot shoe.
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Paul from SWISCO responded:
Hello! If the 15-129 pivot shoe fit in your window track, then consider our 15-121. This has a larger cam but is otherwise the same size.
A home owner from Grand Blanc says:
Thanks.. I assume you mean 15-121. I do not see a 15-1212.
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Paul from SWISCO responded:
Ah, yes! Sorry about the typo.
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