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You could try a Chevy dealership, but it may be discontinued. Otherwise try a corvette salvage yard or find someone who is parting out a C-5 corvette. E-bay is always a good choice too, either NOS or used.
I've had a Dorman on my 2002 for ~10 years. It doesn't leak so I guess it's fine. While I usually don't encourage disabling sensors, that might be the move here.
Summit does have some of the Moroso sheetmetal ones in stock, but those don't work with the sensor off the shelf. https://www.summitracing.com/parts/mor-63787
It's probably easier to adapt a sensor bung to the metal one than plastic