Headlights / Where can I find them

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I am looking for HELLA H4 headlights for my 72 Chevelle as they are very bright and just plug in like the original lights .One of mine is cracked and I dont know where to find them ,they are also a direct replacement for our trucks which is another reason Im looking for them. They were used in some sort of Nissan car or truck several years a go and my internet searches have come up empty .Any help would be greatly appreciated .I have checked all the parts stores and they cant find them either so they may have been discontinued .