I put some Delta xenon headlights on my '66. What a difference. I also found some LED bulbs that fit the '66 GT fogs. That is a huge difference. Rounded out the lighting conversion with some LED bulbs for the tail lights...
Current Stable: 1966 A-code Fastback (302 Ford Crate motor, T-5)
2008 Shelby GT Convertible
Former Mustangs: 1967 A-Code Fastback (sold to buy the ‘66 Fastback 33 years ago)
‘66 A-Code Fastback (owned it from 1986 to 1999, sold it to a friend, who sold it to another fellow Mustanger. I just repurchase the car in Mar. 2019...)
‘95 GT Convertible
‘14 MCA Edition (Mustang Club of America) with Performance Pack