1/2" channel balance with stamp 2740

A quick learner from Cardiff, CA says:
This is from a mid 1990's vintage aluminum double hung non-tilt window manufactured in San Diego, CA. There is a stamped number "2740"; metal part is 28" and 9/16" wide.

Can you identify? Need 4 ASAP.

Thank you in advance! Hope Hurricane Irene not too disruptive!

Michael K.
User submitted photo of their 2740 channel balance.
Profile picture of Paul
Paul from SWISCO responded:
Thankfully hurricane Irene was not too bad in our area (we are located right across the Delaware river from Philadelphia). We were a bit worried about the Delaware flooding out our area, but luckily it did not.

You need to order our S385-28 with the 2740 option.
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