1.6 inch  Red Rectangular Trailer Marker Led Lights 3 Wires Surface Mount, 21 Led diodes per amber light; Designed at 12 DC Volts; Sealed amber led Light, 3 Wires Setup, High Low Function. 

2Be used as led marker light only, this 6 inch rectangle LED lamp is a 3-WIRE assembly, meaning it can be used as both a turn signal AND a marker lamp simultaneously. It can also be used as only a marker lamp (or only a turn signal) by using two wires and leaving the third wire unused. 

3.Size: 6" x 2" x 1.4" approx. and hole to hole distance: 4.8". Dim Function draws 20 mA & Bright Function draws 110 mA approx.. This trailer clearance light is unversal for almost all 12V vehicles as well as the size fits.

4.This Red marker lights is HARDWIRED with 3 wires: Black is ground, white is low brightness as marker lights, clearance lights or running lights, red is high brightness as turn signal lights; Commonly known as a trailer light, these 2" x 6" rectangular trailer lights can really be installed anywhere you'd like to surface mount them. It is going to fit perfectly on your truck. 

Note: This rectangular marker light is generally waterproof, please do not use it in heavy rain or under water, thanks.