As Bill K (bkreigsr) suggests, the threaded pivot pin in front (late 915 shifter) can be adjusted to remove any excessive clearance at that location. If the 3 bushing areas have also been addressed with no other shifter wear, the noise may be transferring from the gearbox.
The first shifter linked is fitted with a Weltmeister short shift kit. It consists of a different shift lever (longer pivot arm) and spacer block. The shift throw reduction (34%) is greater than the factory M241 short shift kit (20%), but does so, in part, by using an abnormally short shift lever, okay if your sleeve length is at least 36", comfortable with reaching and can tolerate increased shifting effort. This can be remedied with an extended shift lever with a slight loss of throw reduction.
Sherwood