You can easily mount '86 Katana 750 front pegs onto the GS500 (other years will
probably work too). All you have to do is grind away some of the material on the back and bottom of where the peg mounts so
that it can move freely in the stock GS bracket.
There is no reason except for appearances to do this mod. The katana peg is about 1/2" lower
than stock peg due to it's lower overall height compared to the GS; the bottom ends up at the same place as stock. weight
is about 1/2 the stock GS pegs.
These pegs look more like they belong on the bike than the CBR pegs because the black rubber matches the brake lever