the '68 should be GE with "wide flute" lens - the Superbird should be "wide flute" but I think there is some discussion GE VS Westinghouse (as bulbs were sourced from parts warehouse VS assembly line ?????? )
The Bird is one of the 1st ones built if that would make a difference.
I had told him I thought they were GE. in both cars
He has a stock pile of NOS bulbs in both manufacturers. I have serious doubts he plans to worry about dates.
He has a bad bulb in one car and wants to at least make them all match instead of the hodgepodge combination of whats in them now.