Thank you and yes, the glass in hand is noticeably different from known MFC's. All of these came one or two at a time with no rhythm or reason. I just noticed they were something other than an MFC but was not fully sure where to put them. That first one is a real trip. Thanks for you thoughts, I am going to have to get the calipers out but I think you are right on with the size of most being around 11/16 and only the second to last being 5/8.