I have collected Seiko watches for 50 years

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

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

SEIKO  6306, 6309, 7548, 7549

Seal kit – contains – generic parts

1 off each 

Case Seal 0C3060B0A  

Bezel Gasket 0C3660B02

Winder Stem Seal 0K0240B0A

Fits these case numbers