I have collected Seiko watches for 50 years

If you need advice on which part, tell me the 8 digit case back number

I can check you have the correct part, or give you the correct part number 

Seiko Divers Clicker Spring & 2 Balls

2 Balls - 1.0 mm hard 420 stainless ( 1 spare)

Spring - made from hard stainless wire, the correct wire gauge, to give the best CLICK,   each one is hand made, end dressed and length adjusted, to be the correct length for your case, no need to cut  the spring

The correct gauge (thickness) is important for divers safety, thin wire equals loose bezel

For  fitting - a blob of silicone grease on the spring head, will hold the ball in place, whilst the bezel ring is pushed on. 2 balls as first often disappears

Original Seiko Part Number - 8135 0180 -made from spring steel, which may have rusted