Help identify the correct coil balance.

A home owner from Virginia says:

Need help understanding coil balances.

First question.
I have a single hung window, sash weight is 19 lbs. Both left and right coil balances are broken. Should I purchase the 10 lbs. left and right? It says it can hold a window 19-20.99 lbs.?

Second question.
I don't know the name of this part, the rectangle peg that fits in the shoe cam (part of the sash), can you firm my size .1875 inches will fit?

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Tom from SWISCO responded:
Yes, coil balances are unique in that to determine the proper strength option, you would divide your sash weight in half. Assuming you have the Series 140 then the S140-10 would be a good choice for your 19 pound sash.

The other part you reference may be your pivot bar, but I can't be sure. Could we see a couple pictures of it? Can you also give me the dimensions of the pivot bar itself?
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