O-ring size for fuel cap?

[5:00]

I did a search and couldn't find anything on size. Looking for the o-ring size for the gas filler cap for a 2007 XLV. I am guessing they are all the same?
Mine is starting to crack and would rather not get any water in there.

[kaneboats]

I have the shiny chrome one-- 2008 LSV. The inside diameter of my O-ring is 1 3/4". Good luck!