Does anyone know if "J" headlamps are correct/original for the MKIX?

My car is original, purchased by my dad new, but headlamps have been swapped out I'm guessing several times since new. none of the ectensive paperwork reveals what was original to the car.

I've been asked to show the car in a preservation class, and thought it'd be fun to get the correct beams. Im guessing halogen lights were not invented in 1961 :-)
Thanks for any help.
regards
greg arnold