How to apply designs that aren't reccommended

So if I search for a design, the game won’t let me apply it to my car. I can save it to "my designs’ but when I go to my designs I can only “report” it.

What am I missing?

You have to be in the right car, and some of the cars look the same.

That doesnt make any sense. When you search, you can search “current car.”

[Mod edit - WSD - All posts to this forums must be made in English, thanks]