I have a extra sets of new, unused factory fresh (not seconds, blemished or returns) Autolite XP103 plugs. I am selling them in sets of 8 for $48 shipped to the lower 48 via Priority Mail. These fit the 2003 Cobras and a ton of other vehicles. PM me if you are interested with your preferred payment method. Here's the Autolite page with the interchange info for all vehicles that these plugs fit:
Autolite - Part Details