Well I am always tinkering when I have to work on something so why should replacing a fog light be any different. What I did was use a 9005 bulb which is 23 watts brighter and doesn't have a diffuser tip. Fogs are now much brighter. Maybe too bright for real fog
. This was an 05 superduty FYI others may be different. You may need to slightly notch the top tab, I didn't but you can see a little notch on the 9145 bulb. Also you can get crazy with this and get up to 100 watt bulb, xenon, yellow, blue, purple, even LED in a 9005. I just used a regular 65 watt, there are also silver stars etc. avaliable in 65 watt 9005 if you desire more white light out of em with out upping the current draw. The 65 watt doesn't seem to be creating any extra heat in the wire due to the extra amp draw but the lens gets alittle warmer but not much. Just thought I would share a neat find.