Need replacement set of Andersen Sash Balances

A quick learner from MD says:
The part size is 6 1/4 (L)" x 3" (W) x 3/4" (D) plus a small flange with the staple in it.

The visible glass measurements of the lower sash of the window are: W= 28.5" L=34"

There are two set of numbers:

U8 11L 12-87
and
U7 11R 12-87

The other number is 11600-17.

I need both left and right.

Can you please send me the price and availability.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
We appreciate your inquiry. We do, in fact, have Andersen sash balances, which are our 24-11L and our 24-11R. When installing these, please make certain that you place each balance on the same side you removed the original from; do not switch them up.
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