Unless your gun letters with something different you can’t go wrong with the sporting front and rear sights.  I believe you want the earlier sporting front sight without the little screw.   I don’t know when the sight with the set screw was introduced.  It’s not in the 1898 catalog and does show up in the 1918 catalog.  The front sight without the screw is somewhat harder to find on the secondary market.  

There are variations on the sporting rear sights as well.  Your rifle most likely had the one with the adjustment screw for the elevation slide.  See photos below of sight on far right.  All these are sporting rear sights.  Winchester changed them over the years.

I agree with Bob.  Most likely you need both of the sights to have the screw.  My 1892 manufactured in 1894 does not have the screw in the front sight but it does in the rear.  If you find an early front sight without the screw I wouldn’t pass it up.  Who knows when the supply of the early ones ran out.  The rear sight on the right in Bill’s post is what you need.  Except, the elevator steps should not be flat, parallel with the barrel.  They should be at an angle.  I could be wrong but Bill’s example look flat like earlier ones?