So let me tell you how my day went. First I called Apple Rubber Products and left a meaasge for Dave. When he didn't call back after about three hours, I inturn called back and talked to mike. I told Mike I had eleven o-rings of various sizes and needed some help in replacing them. This is what I was told next." Apple has an individual order charge of fifty dollars, eleven o-rings=five hundred and fifty dollars". Hmmmmm, 550.00 dollars, maybe a o-ring for Nasa cost that much, but there is no o-ring or o-rings in the world worth that much. Thankfully, I walked into a little out of the way place in Salem Connecticut, and bought everything I needed for 54.63. And that consisted of 10 and 20 pieces of some o-rings.