I have a 1990 notch 5.0 that I am tearing down and redoing. Several years ago I was in a wreck and some guy's did a less than stellar job fixing it. While tearing it down I noticed the core support is stamped 1987 under the Ford emblem that is stamped in it also. I know everyone has 2 different core supports listed that sells them. What are the main differences? Thanks for the help.