Piaa 520 smr lights

[delco21]

Bought a set of these off a junker at the auto wreckers. They work but only was able to get the lights from the truck with about 6" of wire attached.

Can anyone tell me do I need the relay and the switch from PIAA or can I buy other stuff at like princess auto or something

heres a link to the lights http://www.piaa.com/Lamps/Lamp-pages/520smr.html

thanks