If you have pulled the bulb and it truly has two separate pins and nothing else, it is a pin type bulb. I would have thought keystone would have used the much cheaper wedge based automotive bulb that any auto parts store has. The light should be a fairly low lumen rated bulb. My fixture in my 2013 used a 912 bulb and I replaced all three with LEDs that had a temperature rating of 5000 degrees to get a natural sun light output.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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