Hella 5.75in Round H4 Sealed Beam Headlight

If you've got a classic car, an older truck, a motorcycle, or a piece of off-road equipment still running the original 5.75 inch round sealed beams, you already know the drill. The old units dim with age, the reflector clouds over, and one day a bulb dies and takes the whole sealed beam with it. This Hella 002850871 is the fix. It's a 5.75 inch round headlamp that drops into the same spot, runs a common H4 bulb, and gives you a cleaner, brighter beam than the tired glass you're pulling out.

The big win here is the optics. Hella has been grinding headlamp lenses and reflectors for a long time, and it shows. They designed this one to put more light on the road without cranking up the glare for the folks coming the other way. That matters. A lot of cheap round headlights just dump raw brightness everywhere, which lights up the fog and annoys oncoming drivers without actually helping you see. This one has a proper cutoff, so the hot spot lands where you need it and stays out of everyone's eyes.

It's a standard 5.75 inch (5 and three-quarter inch) round format, which is one of the most common headlamp sizes out there. Muscle cars, older pickups, off-roaders, cafe racers, tractors, and a pile of powersports and utility machines used this size from the factory. If your bucket, ring, and wiring were built for a 5.75 round sealed beam, this Hella lamp fits the same opening. Measure your existing lamp across the lens face to confirm before you order.

Under the lens it uses the H4 bulb, the workhorse dual-filament halogen that handles both low and high beam on a single bulb. That's a good thing for two reasons. First, H4 bulbs are everywhere, so a replacement is a few bucks at any parts counter instead of tossing the whole lamp like you did with the old sealed unit. Second, you're not locked into one output. Run a standard H4 for stock-style brightness, or step up within H4 spec if your wiring and housing can handle the heat.

A couple of honest notes so there are no surprises. This lamp does not have a built-in turn signal, so if your setup used a combined headlight and turn indicator, you'll keep your signals separate. It's also sold as a single lamp, not a pair. Most vehicles run two headlights up front, so if you're doing both sides, order two so they match. Hella lists this as an off-road lamp, so if you're putting it on a street-driven vehicle, check your local rules on headlight approval before you rely on it for road use.

Installation is about as straightforward as headlights get. Pop the trim ring, unclip the old sealed beam, and either plug into the existing three-prong H4 connector or wire in a standard H4 pigtail. On older single-filament setups you may need to sort out separate high and low beam feeds, and a relay harness is never a bad idea on wiring that's been baking under the hood for decades. Seat the bulb retainer fully, make sure the gasket sits clean, and aim the beam on a wall before you hit the road. While you're in there, hit the connector with a little dielectric grease and you'll head off the corrosion that kills old headlight wiring.

Bottom line: it's a no-drama way to bring an old 5.75 round headlight setup back to life with better optics and an easy-to-source bulb. You get Hella build quality, a sensible beam pattern, and a size that fits a huge range of classic and utility vehicles. Just remember it's one lamp with no turn signal, so plan your order and your wiring around that.