[spsfiend]

I purchased new H4 headlamps and would like to perform this upgrade from the current H5s I have on my 1987 911. Do I need to purchase any hardware to perform the upgrade or are the H4s a direct replacement? I read that it is recommended I install a higher capacity relay. Is there any other wiring harness adapters that I need to purchase or does the current wiring harness work?

Also, does our host sell the hardware that holds the lamp in place? I notice when I removed the H5s that I am missing the screw on the right of the lamp on both sides.

Thanks so much!