Gerber 99-024-09 Biscuit Trip Lever With Nut. 99-024-09 is the replacement for 99-783-09. Gerber 99-024-09 comes complete as pictured. This Lever Is On The Left Hand Side when facing the toilet.  Other part numbers for this lever are: G009982109, 009982109, 9982109, 99-821-09, G009902409, 009902409, 9902409, 99-024-09. This will fit toilets 2013 to present. If you toilet was made before 2013, you may have to trim the corners of the square to make it fit.