I had the fellow across the street from BCS put film over the headlight assemblies so they'd be protected like the rest of the cap. It seems to do the job, but I've had him redo them once, and they still pucker due to the curve involved, and dirt accumulates behind the film. Nevertheless, I believe the film helps prevent cracks, fending off UV radiation and rocks.
I think both left and right assemblies were available on Ebay, Stan, but good job researching and locating a heck of a better deal!
Joel