I was given what appear to be the original wires for our LeMans when we bough the car. Beleive it or not, the original owner of the LeMans did not change the wires on the car until the year 2000 when the car hit 40k original miles, the car only had 54k when we bought it back in Jan of this year.
The only reason I know when he changed the original set of plug wires is due to the fact that our son was looking through the owner's manual and found a page where the original owner wrote down every oil change (date & milage) and the plug wire change etc. Kinda neat to see all that info...