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I used to own an old Ducati 450cc single cylinder. That thing would shake your teeth loose. It ate headlight bulbs, taillight bulbs, license plates and batteries. It would shake the plates loose in the battery. I got tired of replacing H4 bulbs and decided to try and repair one. I found that the filaments were both ok but the solder connections had been shaken loose. I resoldered the filament connections. Then I drilled a small hole in the side of the metal base and filled it with silicone. I never had to replace that bulb.
My evo vibrates much less than that bike did.
You can get them at any auto parts store (preferably O'REILLY AUTO PARTS) and they're relatively inexpensive. I can't remember the number (seems like I remember it being H9003) but just take the old bulb in or like was mentioned already, it's an H4 bulb with the three wide prongs, pretty standard.
Any GOOD parts store will be able to figure it out unless you go to 'Zone (shudder!) or some other company.
I tried O'reillys, Auto Zone, and Advance Auto here in our town, Natta, one anywhere....neither H4, H4-sd, or H9003's
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