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Well that is that the auction for the light you see above, posted by OP on ebay. I didn't realize these were deltas, so my price assessment was way off...more like $38.50 to $85. And $275 NOS. And they said the hobby was dead...again...
Is the original glass flat or curved? Flat you can make it yourself, curved I sent a link a few months ago where I ordered curved glass from a company that had lots of sizes at a good price. They list diameters and curve angles.