As for installing it is really quite easy. The H4 ring comes off the bulb install it into lens.
Then you may have to trim the rubber but push it on.
Click LED back into ring.
1st ready to go, don't worry about the wires they are for my headlight rings
2nd H4 ring installed
3rd rubber pushed on
4th Led bulb clicked back into place.
The last pick is from my Jeep I cut off the red and black you see.
GMC
http://www.ebay.ca/itm/7-ROUND-DIAMO...item56993ba35f
Jeep
http://www.ebay.ca/itm/86-95-Suzuki-...item4ac7f40961