The bolts were indeed corroded, someone had stripped one, and to be honest, when I did it I didn't realize that they just came out of the heads right there. Had I known with the 3 bolts out I could have removed them, It would have made things easier.I had these bits on my '04 and never felt like it was much work or difficult in any way to remove or replace them when I did my timing cover gaskets. What is the tricky part? Are your bolts corroded or something? I agree that as long as the openings are properly sealed it should be fine though.