Same Felpro vulcanized rubber used here, I didn't have the part number. Check the cover flanges. If there are bent areas where someone used a screw driver to pry them off before, correct that. Use a ball peen hammer to dimple the covers upward at the bolt holes. If they sit right and aren't over tightened they wont leak.
Downside is damaging the paint. I imagine there is someone who spent the coins to renew that textured finish only to find they needed to mar it with tools.
