Tom from SWISCO responded:
November 13, 2019
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. Profile view of 18-166
Detail of 18-166
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