These were the first Meyer plow lights to incorporate a turn signal. Prior to this the turn signal was a separate light. These were used in the 1970's up into the early 1980's.
These were a very short lived light on Meyer plows.
These were used from the late 1980's up until the early 2000's. They have a wrap around turn signal light built in and say "Meyer by truck-Lite" on top of the light housings.
These came about because vehicle manufacturers made changes to the vehicles that required the plow lights to be completely isolated from the vehicle headlight systems. they were standard from around 2003 up until 2013 when the Nite Saber II lights became standard.
these became standard, replacing the Nite Saber plow lights. They use the same wiring and Modules as the Nite Saber Lights.