5-3/8" Diameter round. Incandescent trailer light provides stop, turn, and tail signal. Shock-proof socket protects bulb against damage. Durable steel housing. Flush mount to trailer - hardware not included. 2-Wire design. (1) 2057 bulb. Great Prices for the best trailer lights from Optronics. Optronics Trailer Tail Light - Stop, Turn, Tail - Incandescent - Round - Red Lens part number ST40RB can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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