Replacdment Window Channel Balance

A handy person from Ocala, FL says:
Request review and ordering information; I did one of these, on a different window, earlier this year, it was a 25" Series 351, looks the same, but I'd like confirmation before I place my order...

Thank You.
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Tom from SWISCO responded:

The Series 351 does look close, but that's all I can say based on these photos. The deciding factor will be the depth of the bottom fitting; if it's 1", then the Series 351 is what you want. However it may also be the Series 390, which has a bottom fitting depth of 1-1/8". That's not something we can tell from a photo, you just have to measure it as carefully as you can and use your best judgement.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.
A handy person from Ocala, FL says:
Tom:
1" ....S351 Order on the way...Thanks.
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