Either way, riveting the panel on is a bit tricky because it’s flexible polyurethane. If you apply too much pressure either pulling or pushing you can end up with some waviness in the panel. It’s a drawback to poly but, depending on how the panels are painted or vinyled, you may never notice.
Again — a quality body person is the key.
Even though it’s a race car and a mix of white and black panels, Bryson insisted that one of his people go over every single rivet head with a sharpie to black it out. He wouldn’t let the car out of the shop any other way. I better get a vinyl wrap STAT before he has an aneurysm.
The front edges and the back edge of the skirt simply bolt through the fenders. Well, at least that’s how we did it on my car. It’s a race car and this would make it easy to get them on and off, more or less. There’s probably a sexier way, like going through the front of the side skirt into the fender. Your mileage may vary.
This little rubber insert expands a little when you thread a bolt into it. Simply drill a hole that’s just barely big enough to shove this into, push it all the way flat, and then screw your bolt into it. Since this is just loosely fastening the middle section of the side skirt to the chassis and hidden by the door, it didn’t have to be an amazingly secure fit. You could also have just used sheet metal screws like came off of the old skirts. But… racecar! By the way, you can find these inserts at Ace Hardware and probably other big box hardware stores.