replacing clasp on Planet Ocean, need help with sizing

Hey guys

I’m a complete noob btw got my Seamaster Planet Ocean 600m 39.5 two months ago and got in a motorcycle wreck and completely busted my clasp when I broke my fall so I’m looking for a replacement. What I need help knowing is first of all the lug size of the 39.5? I think I saw someone say it was 19mm but I wasn’t so sure, and if so would a 20mm clasp fit? I saw one on eBay but it was 20 and i didn’t know if that would work. Also would the omega boutique be of any help sourcing or should I just scout eBay. Any help would be highly appreciated finding this clasp isn’t so easy thanks!

Go to the boutique or a dealer and don’t try to source it yourself if this is something you have no experience with. They’re happily help you.