There's one important installation detail to note with these LED headlights. Many cars - I think starting with the U.S. LWB cars and continuing on with later cars - have mounting tabs (I call them ears) on the inside of the fender headlight bucket. If your car has those it most likely will be necessary to either grind down or bend back some or all of them in order to accommodate the LED headlights. I've bent them back with a couple of my cars in the past in order to mount H1's.
Also, if you have H5's, you will need a H5 to H4 adapter. The nicest ones that I have found are offered here at Pelican -
Porsche 911 (1974-1989) - Lights and Lenses - Page 5
- $27.75.
Cheers,
John