replacement balancers for Milguard window

A handy person from Davis, CA says:
My window is Milguard brand. The lower part of the window (the part that moves) is 29 3/4 inches high and 33 1/2 inches wide. My balancers are 27 inches long (measuring metal channel only) and have '26 4 AK CALDWELL' printed on them.
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Casey from SWISCO responded:

I see you recently ordered the S380-27 channel balance as a replacement. It does look compatible with what you have. As long as the 'depth' measurement of your part matches up with ours then you should be good to go. Be sure to get back in touch with us and let us know how everything works out for you. 

Alternate view of 15-005
Alternate view of 15-005
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