Originally posted by Twisted6:
Well we can get the ST220 springs (Which oddly list under several of the newer Ford/Mercury/Mazda 3.0s when I search by part number of FPO or Y2KFord)


That's because they are not specifically used for the ST220. It's a common, shared spring between all 2.5/3.0L Duratec. But it's genesis was for increased durability on the ST220 application.