Welcome, IN10SS. This is sort of a catch-all forum for random mechanical questions; you'll probably be better served asking about your bike over in the Sprint forum
As far as this goes, you'll want to get a set of new spark plug/coil seals from your dealer or Bike Bandit or wherever. They updated the part to seal better in maybe 2007 or so. It was never a recall, but the new part is a direct replacement for the old one even back to the 955s.
(I assume the rusty plug is #1/left? If not, you may have a bigger problem.)