There's several.

Full tang sight with windage - Lyman 29 1/2, Lyman 30 1/2 are your best bests. Can be pricey.

Receiver sights - Redfield 70, Lyman 56, Lyman 57.

Welcome to the forum!

PS: If nobody here has spares, they show up on ebay regularly.

Last edited by Calhoun; 03/13/19.
“The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
Also dates, checkering, engraving.. Find at www.savagelevers.com