Johnson 0.2173.403 replacement O-ring replaces Johnson 05-06-500 O-ring seals and is suitable for Johnson engine cooling pumps:
F35B-9 pumps (10-32388-1)
F5B-9 pumps (10-13392-01 & 10-24334-1)
F5B-9001 pumps (10-24119-1)
Dimensions: 12.3mm x 2.4mm. Made of NBR70 rubber.