So, i was thinking of doing some stuff to spice up my '07 Trailblazer, and i wanted to replace all my interior lights with red LED's, and replace my exterior lights also with HID's and LED's

ive been looking for sometime now, and could not find any places to get the replacements, i have the light part numbers, but i dont know where to find the led's or HID's, let alone actually replacing them

any help?
thanks