rapidboy1,
Seals available from ( for fleabay in the links below, please substitute real name ):
Nikkonos 600/601 https://www.fleabay.co.uk/itm/334608...Bk9SR9633cGHYQ
602/603 https://www.fleabay.co.uk/itm/374326...Bk9SR5jS2MGHYQ
Foest
600/601 https://foest.eu/index.php?main_page...products_id=34
602/603 https://foest.eu/index.php?main_page...products_id=35
Have fun
Best regards
Russ