Maybe find the original hairs? That's also safer, recoloring-wise. If you decide you want to use a different default, you don't need to keep in the old one because you have recolors of it.
Many default creators tend to link to the original hair.
Hair defaults are often made as propertyset defaults instead of full defaults that fully replaces the original hair, and that's probably why they don't show up in Bodyshop.
Thanks for responding, theraven!
But I'm talking about the custom hairs made by Maxis. I don't use CC anymore, and the only CC I plan to use is what I make myself. I'm talking about, for example, the pink and purple bob under the custom section of hair in the mirror, or the blue hair that looks like a recolor of Dustin Broke's. I apologize for not being clear enough before.