I called the factory on these lights. They measure 5-1/2" long and 3" across the end at the lens. They are for a 1937 Ford. The difference between these and the 1939 Chevy lens is the mounting surface. The Chevy is a little smaller and has a flat spot at the mounting surface. It wouldn't be hard to flatten a spot on the 37 Fords if one wanted to use them. I also found 2 used sets of 1939 Chevy assemblies. They are in super condition and bring a super price, $200.00
