I ordered brass shoulder bushings and shoulder screws to tune up my shifter.
McMaster-Carr
6 10mm flanged shoulder bushings 6659K14 @ $2.50 ea.
1 10X35 shoulder screw 92981A325 @ $3.06
2 10x50 shoulder screw 92981A307 $3.44 ea.
The major modification is drilling or grinding the peened head off the shoulder rivet. Be sure and clean out the tubes prior to trying to insert the bushings. I had to use one factory bushing because the brass one wouldn't go into the tube. Also add a washer under the head of the long screws. The factory bolt is 48mm long, but they aren't available. The bolt into the transmission is a royal PITA and getting the Allen wrench into it is also. The payoff is a tight shifter that gives snappy shifts and will last for a long time hopefully.
Jack Byrd