Replace your 194 bulb with a 40x20mm COB LED. This mod requires you drill a 2-3mm hole in the side of your bulb hosing. Use a 2mm bolt/screw. The printed hole should be just below 2mm so, you shouldn't need a nut.
The COB LEDs I used were from Amazon. Search " 40mmx20mm COB 18SMD LED Panel Dome Light". You'll need the 194 bulb adapter (which it should come with).