I doubt a Mog is still using genuine sealed beams, they would be very old & the lifespan was not good
Mine were still working fine after 47 years - only did the swap as I wanted the ease of a H4 bulb as they're available in most garages and I do a shed load of touring.
Mine are still ok after 46 years also. Assuming they are the originals. When I removed them to check the voltage at the bulb I noticed they said Made in Canada (RHD) on the back.
I've just done a relay conversion for the main, dipped and spot lights. Certainly improves things.
