The LED's can be found at
www.autolumination.com under the 3157 lamps. You can purchase an electronic EL12 flasher for the turn signals and hazards also on that website. They are located under the dash on the driver side. My turn signal flasher was located to the right of the steering column about 6 inches away and the hazard one is on the left.
The headlamp housings I got from
www.rallylights.com . I do not know which size you need since I have an LT1 but give them a call. They are good guys to talk to.
They are also where I got the halo foglights. They have a more oval style which may fit. Dimensions for each style are listed to see if they fit.
-Brian