The original EX running board I found at Louis Biondi’s was pyramid black and had the pyramids removed on the side edges but not the ends. Another one I found at Frank Cooks had no pyramids removed. Both appeared to be original. I removed the pyramids on all sides about a ½ border as I liked the look. It gives a nice finish to them. I also did this with the matt inside the car. The round head tacks were spaced about two inches apart. Restoration Supply Company has these also.
I laid the rubber out on a flat bench and laid a straight edge board over it with only the ½ inch exposed. I used a router to clean off the pyramids.
Rolly
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Rolly