Quote Originally Posted by seewavedr View Post
Can the lower portion of the headlight lens be used for brake ducting if the upper portion is still the functioning headlight??
No.

GCR 9.1.4.K.2:
Standard headlights, headlight operating ancillaries, and parking
light assemblies may be removed and replaced with a plate of identical
shape and size of the lens. Standard headlight assemblies may
be replaced with aftermarket units of equal dimension.

GCR 9.1.4.K.2:
Fog/driving lights, parking lights and associated attaching hardware
may be removed. The resulting openings may be used to duct air,
or may be filled/covered.