Okay, here is what I find out. The configuration on the lower lights (the ones with the arrows) is... the inside lights... closest to the grill, are driving lights. Next to the right are running lights and next to them are also running lights. These also double as turn signals, and alternate when the signal is on. I am sure this really does not matter though, because you can make them do whatever you want in your own application. The dimensions of the light are 13 5/8" L on top, 15 3/8" L on bottom by 4 1/2" H overall with a 1 1/2" curvature.
The upper light is 13" L on both top and bottom, with 4" H on the Left and 5 5/8" H on the right. This too has a 1 1/2" curve to it as well.
This is obviously for the driver's side, and will be opposite for the passenger's side
Also, this is off of an '04 Silverado model.
Hope this helps!
Always trying to create something new!
'87 GT Extreme body mod and 2.8L Turbo Propane powered (in the garage and getting closer to being completed)