Do I need a custom balance?

A home owner from Florida says:
I have a balance with a special shoe. I need to order two 26", two 18", and two 30". Do I need to buy the shoes, rivets and balances separately?

Also, I notice that the 30" comes in two comes in two color tips. Is that having to do with the weight of the window? I don't know what mine weights but it's a 51"x 32" tall sash aluminum window. Which color do you think it needs?
Do I need a custom balance?
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Paul from SWISCO responded:
Thanks for posting. We may be able to custom make this balance for you with this special clip attached. Before we continue, can you confirm the length of the inside spiral for each balance you need? In this case we don't need the tube length, but the spiral rod that goes inside of it. The length will be important to determine what will work. We will also need to know the weight of each sash, and how many of each balance you need.
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