PGT single hung window non-tilt

A handy person from Englewood, FL, USA says:
1/2" channel 37" long
Markings: 36 4 BS1 RV
BS1 or BSI rotated 90 deg

I also need the clips
that reattach the channel
to the window.
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Casey from SWISCO responded:

Thanks for posting on our discussion board. Have a look at our S395-37 channel balance. This balance comes assembled with a 19-005 balance top and 15-001 bottom balance shoe. It's imperative you match up your measurements with ours to confirm whether or not this is the correct replacement recommendation. If everything looks good, then you can go with the 3640 option that hold a sash weight of 23-30 pounds. 

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