: A massive US-based distributor stocking everything from movements (Seiko, Bulova, Casio) to tiny screws, stems, and crowns.

: A highly respected US supplier often used by professionals for high-end or vintage parts.

For those looking to customize their watches (especially the Seiko SKX or SRPD lines), these shops specialize in aftermarket "mod" parts like sapphire crystals and ceramic bezels.

: One of the world’s largest suppliers, frequently cited by hobbyists for its massive inventory and global shipping.

: A long-standing Canadian supplier that offers a wide array of movements and comprehensive repair kits.

: Another reliable US source for batteries, bands, and movement components. 2. Specialized Seiko Modding Stores

Whether you're restoring a vintage heirloom or building a custom Seiko mod, finding reliable components is the first step. Here are the best places to buy watch parts based on your specific needs: