Dumb stupid dumb question

Cool. What’s the ID or does it matter? I have 4 different O rings out there and not one of them fits. They either are too small and leak expensive transmission fluid all over the headers or 5 good men and a boy couldn’t shove the tube in the hole.

If I can get the correct O ring I’ll use the OE tube and shove that “Allstar Performance” tube right back up Summit’s behind.
9/16 ? ID 3/32 thick