Case back opener size for 126500 Daytona

Tried finding online and couldn't get a definitive answer. What is the size of the case back opener for daytona, 30.5mm or 31.5mm?

I have this set and the sub and gmt use the 29.5mm opener

Thank you!

Tried finding online and couldn't get a definitive answer. What is the size of the case back opener for daytona, 30.5mm or 31.5mm?

I have this set and the sub and gmt use the 29.5mm opener

Thank you!