Tom from SWISCO responded:
June 16, 2020
Based on your photos, you have either our Series 351 or Series 390. The only difference between them is the size of the bottom fitting, which is indicated on their respective store pages. You'll need to measure your bottom fitting to confirm which one is best. For the top sash guide and take out clip, see our 18-008 and 16-002, respectively. Comparison of the S351 and S390 balance shoes.
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