Installed these on my '66 Mustang with a relay upgrade. I had to modify the bucket (the part that floats to adjust alignment) by opening the hole on the back to about 2 3/4 inches, and also had to slightly open one of the three alignment slots that the headlight fits into enlarge about 1/8. ', and we also sand down the rubber extension on the headlight drain pipe bushing, but the fender didn't need to be modified as it came in depth. I used something like a dremel to make this 2 3/4" hole in the back. Much brighter than before (like modern headlights!) Very happy. Used this relay (but I don't know how waterproof the relay is is): https://www.amazon.com/dp/B089M4DC45?ref=ppx_pop_mob_ap_share
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