Window channel balance

A quick learner from san diego says:
1/2 inch wide 28 inches long non-tilt window channel balance.Marking on channel is 27 5 which channel balance do I need? Please see the pictures
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello! Thanks for posting. I can't tell exactly what this balance is. I think it could be either our Series 380 or Series 385 but it would depend on the depth of your shoe. Which of these is closer? The shoe depth is the only difference, so you will have to measure yours to confirm a match.

Although, on closer inspection it appears the hook at the bottom of your balance is a little different than ours. Could I get a better shot of that so I can be sure?

If you also need a new top sash guide, look at our 18-171. This is a newer version of yours, which actually isn't made anymore. You may have to cut off the top to allow it to fit under the sash frame.
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