About 4 or so months back I scored a Unity OEM left hand spotlight for my GMC. All the brackets were included, which you need to mount and install the light correctly.
HOWEVER, without the help of MARK BRAZELTON, who wrote up a very detailed procedure on the steps to take, I would still be scared to try and install the light.
Well tonight after getting some help from Mark, I got the light installed perfect. Took about an hour, I read everything twice and did every step as a practice step first. One accessory down and about 15 to go
http://community.webshots.com/album/577957428vTTyKeJake