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I had a headlight conversion kit that required 9004 bulbs, but I used 9007 bulbs instead. I couldn't find any difference bewtween them. The packages listed the same power usage, they had the same plug, and the same locating tabs. The only thing different at the time(3-4 years ago) was silverstars weren't available in a 9004 yet but the 9007 was so I got them instead. I cant see any reason why you cant use the bulbs you purchased.
1993 F-250 HD XLT Lariat SC 4X4 7.3/5spd ATS WG turbo @ 12psi, 3" DP 4" straight exhaust, 5" stacks, Hypermax cowl induction, IP up 3 flats, DPS stage 1 injectors, GPR LED mod, Pyro/Boost guages-186whp 363wtq @ 10psi
1986 F-250HD XLT Lariat 4X4 6.9/T19, soup bowl mod, straight pipe.
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