DDM lights

So i was following you guys recommendation for the DDM light kit.

http://ddmtuning.com/products/101/

I'm looking at this kit, and wondering do they snap into the light pod like the stockers?
And do i need anything else beside this kit to fit the Impala?
55 or 35w? 5 o 6k. This is all new to me. Just looking for recommendations before i buy.

Thanks Rich for the info on the LEDs over on ISSF. Good stuff.

35W. 5K. Plug and play. (But you do need to run a power and ground to each ignitor sometimes....

Also if you want the High-Low or not