Magneti Marelli makes these H4 headlights only for Porsche and they are referred to as the current "genuine H4's" given that the original H4's in the early cars were made by Bosch which no longer makes them. These are made with high quality materials to the high level of quality of the originals.
Available in your choice of chrome or paintable black trim rings. Holes for adjustment screws are at the correct 2:00 and 8:00 level. Standard H4 halogen bulbs are included at no additional cost. You can upgrade to the premium Tungsram (GE) MegaLight Ultra 120 bulbs, which we highly recommend.
Fender gaskets and mounting screws are included. Depending on what headlights you are upgrading from (i.e. Sugar Scoops and H5's) you will need the optional H4/H5 adapters.
Otherwise installing your new H4's is a 10-15 minute plug and play job. Simply remove your old headlamps and install the H4's.
And don't forget to adjust them! It's easy with H4's and not only does it improve the performance of your headlights it's a courtesy to other drivers. You find a great how to article by our friend and consultant Daniel Stern here: Daniel Stern Lighting