[Sam Kapasi]

Hi Vivek,

It depends on the car. See in a car like the swift or the esteem, there is a 2 din jappo mount. Then you cannot use the cage, and 4 screws mount directly into the HU. Be sure to use the supplied short screws or you may touch something inside.
In cars like the Zen, Alto etc you have to use the supplied cage, There are plenty of Dog Ears all around the cage. You slide it into the hole provided and using a flat screwdriver, just bend out 4 to 6 dog ears.
Then slide the HU inside till it clicks. It really is very simple.