Model 99 sights

Was just gifted a model 99 that was basically in the attic, forgotten, for about twenty years. It's in very good shape and just needing a good cleaning. It has a Williams 'peep' rear sight mounted on the receiver. I'm looking to replace the sight with an original buckhorn style rear blade. Any help locating a source will be appreciated. I'll be hitting the range this weekend to see just how well we get along. Much thanks.

ebay, GB etc. But to find the correct sight you are going to have to provide more information. Sights changed with models and years. So picture of the rifle, description barrel length, straight grip, pistol grip and serial number will help narrow it down.