I'm pretty sure I've seen a fluted metal bowl with rear access on a production Ford, maybe a Corsair. There's a "70 Ford Mustang Headlight Headlamp Adjusting Bowl Bucket" on eBay now but no diameter mentioned.
How about taking a plastic headlamp bowl and slicing it (like the top off a boiled egg!) with a hinge and clip fastener. Do half the cut, then mount the hinge before completing the cut to ensure alignment. If you need good weather protection, take a second bowl and slice a bigger cup shape off it so there's an overlap when brought together. Use self tappers to secure the two parts together.
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