Been there, done that.
Unless someone here has them, I think your best (& easiest) option is to take the bracelet to your local watch maker & have him replace the pins. Most watchmakers stock these. Otherwise, most watch parts supply companies sell them, but you will need to know the size & thread pitch for proper fit.
Best option is to replace the bracelet with a better bracelet--either a gen or 1 of the generic, Swiss-made replacements most watch parts supply companies sell. These tend to be Rolex-quality, but without the brand markings.