“Shouldn’t need 2 fuses” with stock sealed beams, or even sealed beam Halogens maybe not. Two reasons I have, first redundancy, should a fault develop in either the high or low beam circuits while I’m blasting down some dark country road some night I can flip over the other functioning headlamps. One fuse, I’m screwed. Secondly, as mentioned I’m running higher wattage bulbs, both low beams =110 watts or about 8.2amps @ 13.5volts. All four high beams=230 watts or 17amps @ 13.5volts. A lot contemporary cars today will fuse protect each side as well as each circuit, again redundancy.