Answers to your questions:
1) I dont know why that circle is there on the sides of the clear corners. Its not for a bulb or anything, maybe just to serve as a reflector or some shit :dunno: It was hard to find the all diamond like clear corners.
2) I dint use nightshades on the tails. I found another way from an audi site. Go to your local hobby shop and they sell window tinting spray for model cars. Comes in a small spray can and costs about 3.00 a can. (took two cans for the tails, and they are pretty damn dark. Just clean the taillights real good first with paint thinner. ( it wont **** them up) Then spray light coats on every 15 mins or so till they are as dark as you would like. Then get a can of clear coat and spray a few coats on top. So for like 10 bucks in supplies, and a hour or so of work, you have something different. Im actually doing another pair i have because i think i want to go a little lighter.
Also if anyone needs a gm rollpan, i got my old one up for grabs with lights assemblies. Its white now, but has paint chipping, so it needs resrayed anyway. Looking to get about 50 shipped for pan and lights.