Measures approximately 4-5/8" L x 2-1/4" (Widest Point) x 3/4" H.
This light is a three-wire, stop/turn/tail light.
This is a flush mount light which requires the use of a mounting rim, such as the ones shown below.
This light is hard-wired with three male-end plugs, connected to the back of the light by a few inches of wire.
This light is RED when on.

Converting all your incandescent lights to LED? You may want to read about LED flashers.