This is a genuine Lucas H4 P43t base (12V 60/55W) vertical dip halogen bulb, imported from the UK.
Lucas part number LLB472, interchangeable with part number 9003.
It is correct for our Lucas H4 and PF700 headlamps, among others; see Related Products below.
We also carry high output xenon bulbs (same wattage but 30% brighter) and blue bulbs for the same applications, as well as several other headlamp bulbs; see Related Products below.