Part Identification help

A quick learner from Jacksonville, FL says:
To whom it may concern,

Respectfully request assistance in identifying the correct part numbers for the attached pictures. I am thinking the right match will be a 28 inches long Series 351 Channel Balance with with a 15-002 shoe and a 19-002 top attached.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Based on your pictures, it looks like this could either be our Series 351 or Series 390 channel balance. The only way to be sure which is better is to measure the depth of your shoe and confirm which of our options is closer in size.
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