Sorry, not yelling, just thought I could have gotten an answer before now. I only posted the question 200 posts ago.
Anywho, I saw that site but it says they are for the mini and protank 2 & 3.
1) Would they fit the aero & 2) I don't want to buy 100 of them!
Do you want the size or a place to buy them?
Replacement O-Ring for Kangertech Protank/Aerotank
http://www.ebay.com/itm/New-Genuine...placement-O-Rings-FREE-SHIPPING-/251453729875