I didnt reuse the original screws on my TPS when I changed it because the head on one was very close to stripping even with the security torx, it had rusted. So I used hardware I found at menards that matched the thread and the length. However, this aftermarket TPS(No motorcraft available, dont look at me!) doesnt fit the shaft of the screw "securely, so if I wiggle for and aft I can slightly move the TPS. I think this was causing some of my issues because the ratch or whatever.. maybe