h4..... if you goto autozone they might have another bulb number that isn't h4... because the h4 is classified as an "offroad" version of a number bulb they carry there... don't ask why, but that has been my experience maybe not others 
but they are known or are h4's 
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Ricky..- 2000 Civic Si (ebp) Laskey, Benson, Full-Race, Jb Weld, gt3582r powered | 628whp - 370wtq
- 2005 Scion Xb (blue.o.p) w/ 121,000+ miles | turbo sleeper in progress
- 1987 Dodge Conquest Tsi w/ 65,000 miles | 1.0bar on an 18g
RIP Earl Laskey djRICKY.jay
