Soda keg seals

Good afternoon good people of this forum, I need to buy some keg seals in bulk and remember a few years ago a thread on where to get them and the sizes needed, I did a search but had no luck can anybody please post a link or the information again. Many thanks and Cheers

McMaster Carr, Grainger, etc, Dash #109, get BUNA, and get a tube of FDA approved lube also,

#109 is good for the dip and gas tubes. #111 is good for the outside of the gas and liquid posts.

Amazon have them dirt cheap and on prime.