I have read 2 different posts of the headlight bulb replacements with 3 different bulbs, (H7, H11, H13)

I have a LT2, does anyone know which bulbs they take?

Also, with the HID conversion, do any of the kits cause the headlight plastic do discolor or get to hot?

 

I can tell you that the low beam on my LTZ is a H11 bulb. I don't know for 100% certain which bulb the high beam takes.

I have installed the HID conversion and it looks great!! As for any "longterm" effects of the bulb on the plastic lens cover...I can't answer but would think that it will have no adverse effects. Heat isn't a problem either as the HID's actually burn cooler than the stock halogens.

Hope this helps.