I'm hoping some kind person can measure up a standard safari snorkel head for a standard safari snorkel for a Patrol?

I need the ID of the section that slips over the snorkel body and has the hose clamp around it. (A on picture)
The internal length of the inside flat section that slips over the snorkel body and has the hose clamp around it (B on picture)

Thanks for any help.

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