24HDB Channel balance is 26-1/2" long

A contractor from Akron Ohio says:
I have a DBL hung window with channel balance. The balance for the lower interior sash is marked 24HDB but it measures 26 1/2" long. What balance do I need to use to replace it?
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A contractor from Akron Ohio says:
I also need to replace this pivot
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Paul from SWISCO responded:

Huh, that's strange. This looks like our Series 751 channel balance, but a stamp of 24HD on this kind of balance usually indicates a length of 25", not 26-1/2". Can you double check to be sure? If it is 26-1/2", it will have to be specially made. In that case we will need you to tell me the exact weight of the sash and how many balances you need altogether. 

As for the pivots, see our 26-151 and 26-162.

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