I am looking for a replacement crystal for my Fossil FS-2689
You are not going to be able to get a crystal for this watch without either contacting Fossil and trying to buy it from them.
However I recommend that you go to a jeweler/watchmaker and get it done there. It is not so easy to replace a crystal in a watch. Cementing it in can go wrong easily if the cement gets on the crystal or drips on the face it can go bad.
on Apr 13, 2019