Light Question

[Eastcoastlaxin]

so I bought my Dad's 29A from his estate; couldn't sell it. When he bought it in 2011 it had aftermarket fog lights on it. I failed inspection because one of the "blinkers" (AKA Fog Lights) didn't work. I have two options; remove the fog lights all together or find a replacement for the Wegner 4015A 6V lamp which has proved to be near impossible. I did however find a Wegner 12V lamp that is the same size. Can I run a 12V lamp on a 6 system? I figured I could but it would be dimmer but I am unsure of this theory. I'd hate to take the fog lights off because tat is the way my dad bought it; kind of want to keepit the same. Any input is greatly appreciated. It does have the 6V generator and not the alternator if that matters. Thank you all in advance for input.