I would stay away from that cheaper ebay crap. You usually get what you pay for.

 

if you guys are going for an h4 conversion get the deltas from california mustang or whatever site you shop on


trust me those things are so much brighter than the slyvania superstars i had before

 

So no one is really posting make and model number of the bulbs they are using. I did the relay install thing a while back which helped a bunch, but have not made the switch over to the newer better bulbs. I am still running the old style sylvania halogen bulbs in my four bulb '69 Mach1. So what are the best bulbs to use, assuming the wiring relay mod has already been done? Do you need to modify the bulb bucket to use the new bulbs?