This dude i used to ride with bought a whole bunch of main jets for his 2000 cr500.
These are genuine Keihin jets purchased from Sudco. When he bought them Sudco told him they would only sell them in packs of 4, so he ended up with a shitload of extra's.
Each set will include a 55, 58, 60, and 62. I have four sets ....$12 a set including shipping. These are all brand new jets.