Bushings for the starter pinion shaft were never available as a replacement part
Whether the bushings are worn or you just want to give the starter on your FT 500 every chance for survival
This is an upgrade that requires a rotary tool to remove old bushings and modify the side cover bushing hole
The side cover can be modified without being removed, (I've done it) but metal chips can get into engine if you do not take precautions.