Group, Well I might as well go around the car. The side marker lamps original from the factory are 12 volt 4 watt Thorn brand. Weird #'s and a weird style name. I'm not familier with there style # they use and it isn't in the catalog Sylvania/Osram. They are 12 volt and most of the 12 volt bulbs have a 200 or 300 hour life rating. If you go to the 14 volt bulb,G 31/2 style glass which is the small round glass. Then #53 14.4 volt 0.12 amps 1000 hr life rating will work just fine in all outer marker holders. If you want the longer glass style which is T-31/4, Mini Bayonet, then the 1816,1815,1891,1889,1893 or 1892. They will all fit and have different hr's of life and different current draw. 1893 has the highest current draw at 0.33 amps and 2500 hr's life rating. Hope this help John hervey