You don't need a kit for that. A DIN mount is just 2 screw on each side. THe stock radio already fits with 4 screws on each side in a 2DIN pattern.
I just went and bought a DIN pocket and it mounted up just like the radio did above it. Just try it. It will work. It only takes like 3 minutes to pull the radio anyway.
(at least in a 2000)