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Depending on the type of bulb kit you currently have the number will be either H3 or 881. I just installed the auxiliary lights on my 09 Street Glide and did some research on this myself.
Found out that HD uses two different types of bulbs depending on the bulb kit you have.
For the bulb kit that I purchased it was the 881 but I wanted something brighter than stock to match the brightness of the Silver Star Ultra I have for the headlamp so I went with the Silver Star 893ST. The 881 bulb has an angled base where the 893 has a straight base so I took a chance and the 893 has worked so far. I was a little tight but the trim ring went on fine. They've only been on for a week but so far no problems.
It always seems that if one bulb goes, the other is soon to follow.
I know with cars, they tell you if one headlight bulb burns out you should replace both. I used to think this was just a line of BS to get you to buy more bulbs but I wonder, if one bulb on a circuit goes out will the one that is left burn hotter on the slightly higher voltage in the circuit and then burn out?
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