I doubt a Mog is still using genuine sealed beams, they would be very old & the lifespan was not good
Replacing a sealed beam unit was the first job I did on my Morgan so that one is 13 years old. The other was on the car when I bought it - It may, for all I know, be the original. The sidelight bulbs, however, used to blow regularly until I replaced them both with LEDs.
