I'm finally installing the heads, (I know I'm slow. I'm a fricken flooring contractor not a mechanic.) Anyway, I used felpro gaskets and bolts. (From autozone) The bolts they list are 1" - 1 1/2" short. We found the correct size by looking at 1999 which had the option of before or after some date in 1998. We used the "after" date and they were correct. My question is, could the heads have been changed from 96 to late 98 - 99 and still fit? I tend to think felpro just screwed up, but if so, I wouldn't be the first to have this issue.