Below is the only 16" lid we carry. Unfortunately I can not guarantee any of them will for your pot perfectly. Our cookware lids are brand specific. This lid fits Polar Ware pots with an overall diameter of 16 3/8" & 16 5/8".
17 3/4" is the outside diameter. Unfortunately this it not an items that we stock so I can not measure it for you. I contacted the manufacturer to get measurements but they said that this lid is on back order for 8-10 weeks and they do not have the measurements on hand. I am truly sorry for the inconvenience.