I found this 7" round headlight in the LMC 1973-1979 Ford Truck parts catalog. Didnt seem bad for the price. Not sure what dia is "really" needed for a 450. Maybe the MFG has other sizes.
Not so much the size as the mounting.....Car has a compression bezel, bike element has tabs with bolts for pivoting that mount to the front 'ring".... Motorcycle application "lensing" is also aimed differently.....
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