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The Indy pace car spoilers. As they are generally referred to. Are indeed bolt on. The front one is a bit of custom work getting everything to fit up properly the first time. And they are easy to break. The rear is actually a matter of getting holes in the right places.
And good luck with your search. However, if a L82 4 speed is what you require. Narrow that down to 78-79
While there’s no fiberglass work that needs to be done, I would t call them truly “bolt on.” You will need to drill holes in the body to mount the pieces. It’s also common to put the ‘80-‘82 rear bumper with the built in spoiler on earlier cars. I prefer the look of the pace car one though. Here’s an article with more information and instructions on installing the front splitter.
Heres a car I saw on marketplace the other day. I’m not usually a fan of brown cars, but the wheels and spoilers really make the look.