Most sprites zip files include a massive amount of sprites, I don't think you may be able to find any Rock Lee only pack. And with "already cut" you mean ready to put into MUGEN? That's even HARDER to find, and most times they're took out from already made Rock Lee chars.
Or maybe you can use another Rock Lee char .sff file and make your own coding and all? Altrough IMO that will lack originality but... It's your decision