headlight recommendation for my Duster

ok so im liking the Hella vision plus , sounds like a good system, slantsixdan likes this also... heres my dumb question cuz i know very little on this topic, since its a halogen conversion and essentially a 2 piece unit, will it fit in the headlight housing on my 73 Duster?
Yes. At least all of the ones I've tried.
Do check the wire cable route. One night the headlamps were going out on my Barracuda but the bulbs and fuses were OK. Found the original wires (especially the left low beam feed) was rubbing on the metal bucket tripping the breaker inside the switch. I made the relay harness modification myself so should have seen that when I tied it in.

I don't think there's a legal issue anymore with E-code lamps properly marked.
The Hella Vision Plus lamps have DOT automotive specs and the three nibs to mount a mechanical aimer so should be legal in any state.
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Technically they should have an HB2 version of the the H4 bulb. I wouldn't worry about that.