They seem to be USA size 017 or close enough. 11/16 ID × 1/6 CS. Found some at Ace hardware.
Ace is the place!!! Hahaha glad you found some. This is something good to note for future times. I just had mine out and was hoping I wouldn't mess up the o-ring. I used to work at Ace, they are usually pretty clutch.
Good stuff man.