My backup lights are a sealed unit light bulb & lens in one caseing about 4" dia. Had to replace one a month ago. Bought it at Pep Boys auto parts for $5.
Dan Sees, Full Timing in the MH & Part timing in a S&B In Hampstead, NC
2013 Winnebago Journey 42e, 2014 Featherlite Car Hauler 3110 17.5', 2008 Mazda MX5,
2008 Toyota FJ Cruiser