block and tackel balance replacement

A home owner from West Springfield, Ma. says:
The length of the aluminum channel is 27". The plastic ends do not have wings and the only stamping on it reads 26 B which does not match any of the Series 385 descriptions. What do I need to order?
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Tom from SWISCO responded:
I can't be sure. We offer a couple different balances that resemble the Series 385 without wings. See our Series 351 and Series 390 to start out.

Keep in mind that the stamp is not used in identification. It only tells you how strong the spring is. In the case of the 26B, it is likely a match for our 2620 option, but you can always weigh your sash to confirm.
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