Third picture shows how extender should be mounted on clasp. You may need to grind bracelet end during assembly. If your watch bracelet is too short
How to Install a Standard Buckle Extender to a Metal Watch Band
Watch Strap Bracelet Extender SILVER/extend straps bands /clasp /Extension Link
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W6129 Steel Watch Strap Bracelet Extender Clasp Extension with Step Gold or SIlver Color
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Seiko Sarb035, Page 2
Watch Strap Extender 3mm / 4mm / 5mm for Wrist Watch Bracelet Extenders Band Clasp With Fold Over Link Clasp
How To Order a Watch Bracelet Extender - Esslinger Watchmaker Supplies Blog