Four Inch Amber Lens Replacement
More alternate parts. A fairly decent replacement for the Lucas four-inch amber lens is a replacement lens by Grote, which can be found at Central Tractor for about $2.79. It is their part number 55573. The Grote lens is not drilled, but that can be remedied by drilling, and you will need to grind a little flat place for the machine screw head. It was a bit shallower than the one from the Prince of Darkness, so you'll need to get shorter machine screws. If you get flathead screws, you can countersink the front of the lens where the screw head seats.
Reprinted from the OVLR Newsletter, October 1997