The seal goes behind the running board to keep stuff from splashing up onto the boards. I get what you are saying about the retainer being contoured. Leave that as is and flip the seal around. If it has to stay that way, nobody will see the screws once the running boards are on. The more important thing would be to get the seal behind the running boards as designed.
Last edited by Twin Jimmys; 10/08/2023 12:06 AM.