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Seiko Mod Spare & Replacement Parts
Find the small replacement parts that keep a Seiko mod build running at Watch&Style. This collection focuses on the individual spare components modders reach for most — gaskets, spring bars, spring clicks, movement rotors, day and date wheels, stems, clasps, and buckles. Whether you're replacing a worn part or sourcing a specific component mid-build, this is where you find it.
What's in the Collection
The collection covers the practical spare parts of a build. Gaskets (glass, bezel, case-cover) keep the watch sealed and are sized per platform. Movement rotors come in several finishes to dress up an exhibition case back. Day and date wheels — including kanji day wheels and 5-o'clock-window date discs in black and white — let you match or change the calendar display. Spring bars (slim and fat), spring clicks, NH stems, clasps, and buckles round out the essentials.
Fitment & Compatibility
Many of these parts are platform-specific — gaskets and spring clicks are sized for particular cases (SKX007, SRPD, SSK, SRPE, SRP Turtle), so check the product details against your build. One important note on spring bars: the SKX007 uses fat spring bars, while the SRPD and SSK platforms use slim spring bars — match the spring bar to your case. Pair these parts with your case, bracelet, and other build components.
Frequently Asked Questions
What's the difference between slim and fat spring bars?
It's the thickness of the bar. The SKX007 uses fat spring bars, while the SRPD and SSK (Seiko 5 GMT) platforms use slim spring bars with smaller lug holes — a fat bar won't fit the slim lug holes. Match the spring bar to your case to ensure the bracelet or strap is held securely.
Will these gaskets fit my watch?
Gaskets are sized per platform — match the gasket to your specific case (SKX007, SRPD, SSK, SRPE, or SRP Turtle) using the product details. Replace gaskets when swapping crystals or case backs to maintain water resistance.
What are the day and date wheels for?
Day and date wheels are the discs that show the day and date through the dial window. Replacing them lets you change the language (such as kanji day wheels), the color (black or white), or the window position (3 o'clock or 3.8 o'clock) to match your dial and case. Match the wheel to your movement (NH35/NH36) and crown position.
Browse the full spare parts collection above to find the component you need.