Gerber 99-024-25 Bone Trip Lever With Nut. 99-024-25 is the replacement for 99-783-25. Gerber 99-024-25 comes complete as pictured. This Lever Is On The Left Hand Side when facing the toilet. Other part numbers for this lever are: G009902425, 009902425, 9902425, 99-024-25.G009982125, 009982125. 9982125, 99-821-25.