Gerber 99-024 White Trip Lever With Nut. 99-024 is the replacement for 99-783. Gerber 99-024 comes complete as pictured. This Lever Is On The Left Hand Side when facing the toilet.  Other part numbers for this lever are: G0099783, 0099783, 99783, 99-783, G0099821, 0099821, 99821, 99-821, G0099024, 0099024, 99024, 99-024. 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.