There are 2 versions of the PI heads. These are intended for the 11 bolt romeo heads which typically were found on 99-00 cars. 01-04 cars typically had Windsor style PI heads that had 13-14 bolts. If you already have the heads, you will need to count how many bolt holes are present. If there are 11, these will work. If you have 13-14 holes, TFS-51811802 is what will be needed for those heads.