Re: HOWTO: Upgrade 7” Sealed Beam Headlights to 2007-15 Jeep Wrangler Headlights
I've never had any trouble finding H4 bulbs, locally or online. Most of the bikes I've had use them. Afaik all H4s are hi/lo, never seen something advertised as H4 that's single filament.
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1973 C20, 350/350
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