I burnt a plug by not checking for corrosion. My plug was major corroded. You local NAPA or Checker Auto/Kragen stores should have them. I actually burnt the Checker one and replaced it with the NAPA one. The NAPA one seems to work better. You will need to cut off the old plug and just match the wires, wire for wire on your pin out.
1987 260E Charcoal Grey 157,000 Miles
1987 260E Forest Green 120,000 Miles