What top sash guide do I need?

A quick learner from Jacksonville Fl says:
October 4, 2020
Channel balance S380 (29-4) 30". Currently have a top sash guide with the measurements of 1-9/16" long. Top width 7/8". Bottom width is 5/8". What is the correct top sash guide needed? I can not seem to find the correct one on this site. Will item#18-166 or 18-018 work?

I ordered and received 1/2" top sash guide item#18-036 which I think is too small.

Thanks in advance!
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Tom from SWISCO responded:
October 8, 2020

Looking at your photos, the first part to pop in my head was the 18-166. This looks very similar in terms of design, and you can see that it is 7/8" across the top and 5/8" across the bottom. However, those are only two dimensions among many that you have to check. You need to go over each measurement we show on the 18-166 store page to confirm they match your existing top sash guide. That will tell you for sure if it will work.
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