Do you need to replace the entire lever?
61316999578. (from 11/01/2017)
61319364798 (11/01/2015 — 02/26/2018), Bilaterally exchangeable
61316991212 (11/01/2050 — 02/21/2017)
If you need only the end knob you turn to change gears:
61319343699 Rep.kit, gear switch cover/rotary lock