Top Sash Guides for an S351-29

A home owner from Ripon CA says:
Please identify the correct upper sash guide for my windows in order for me to purchase replacement parts. I have been ordering the S351-29: 29" Series 351 Channel Balances for the same windows.

Thank you-
Bob
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Tom from SWISCO responded:

Hey, Bob. It's tough to say for sure what top sash guide you need. The S351-29 is compatible with a bunch of different kinds, and I'm not sure what your dimensions are. I would start by looking at our 18-166. This looks close, in terms of design, but I recommend going over each dimension we show to see how they compare. If any differ, please let me know exactly how.

Ours also lacks that metal plate, but I don't think that's important. We can probably get away without it. Either way, let me know how these measurements compare.

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Detail of 18-166
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