Each replacement foot needs to be taken apart so you can attach it to the case. There are two small screws holding a plastic cover. It lifts up and you have three pieces to replace the old two piece foot.
First you will need to feed the pig tail into the hole that holds the base clip. It has a small slit in it so the wires will feed through there without binding up.
Replace the case screw that holds it all in place. Then attach the last cover piece with the LED. Tighten the small screws that holds the little cover on to finish it off.
The below picture has a small arrow to one of the small screws. On three of the feet one screw was stripped out so I was not able to remove them with out some moddifaction...Dremel time. The screws were changed from the phillips to a slotted screw top. First one I ran across made me wonder if I messed up the screw heads but I did check out the others and found them to be faulty also. The modded change didn't take long and everything else went together fine.
So I put the case back together and grabed a few pictures as the case sits in the dark. Front view with one of the LED fans glowing like a champ as well as the feet. The other fan is not as bright. The two LEDs give off more light than my two year old CCFL that is sitting at the bottom of the case.
Over all it does add more light to the case. A couple of road blocks that I had were the stripped heads. At $9.99, it's quite an affordable addition to your case. If your case is not supported, you can still install these feet. Sunbeam has included instructions to modify your case to make these fit.