Had my fan speed control relay act-up on me, so I needed a replacement. Would take too long to get a real GM unit, so ordered this set. Nice that they come with 5 relays and wire harnesses, though I don't currently have a need or use for the harnesses. The only thing was that I had to remove the metal tab the relay comes with, or else my fuse box wouldn't close. Fortunately, the metal tabs just slide in/out.