These ford seals may or may not work with sertain valve springs, be sure to measure all Id/od before committing.   So I'm in process of figuring out why some of my seals are tore/smashed. Finding out that new style seals 03 and up may work on our 2nd gen. They are held in place by spring and can't come up from too much boost etc. I've spoken with https://ussealparts.com and they have both styles at great prices, although top hat style is listed for 03 and newer. The difference I believ