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If you are racing your RC truck in the ULTRA4 style you will need this light bar for Regulation Lighting systems.
It directly replaces the cross bar just above the Radiator on the rear of the truck and can hold 6x 5mm LED's. there are some small channels for routing small wires(I would suggest 26 to 30 guage wires).
Glue your LED's in, wire them up and install using 2 M3x10mm(8mm is ok but no shorter and Defnitly not longer) butten head screws.
Due to the nature of 3D printing you may have to ream out the screw hole with a 2.5mm drill bit and the LED holes with a 5mm drill bit. Always test fit parts before drilling.
Pictures are of a 3D test print, not of the Shapeways print. The shapeways print is much nicer.