In addition to the 5x7 rectangle bulbs, Holley makes RetroBright headlights in 4x6-inch rectangle, 5.75-inch round, and 7-inch round, all in 5,700 K or 3,000 K color temperatures.

Read about the improvements made on the 1937 Plymouth Sedan headlights by Headwinds using the stock preloaded lens springs to blend the old and new, inside Rod & Custom Magazine.