Crutchfield is the way.
1997 Honda Civic
Again, this is why I'm glad I went through Crutchfield. I bought a stereo, came with a dash kit, and wire harness. No hassle, truly plug and play.
Pros: Exact fit for my car. I've had other "wire harness" where the ground literally tied into nothing. This one was super simple to install.
Cons: No cons found.