Tom,
What do you mean by 'lights'?
Tail light lenses and frames?
Bulb holders?
Fog light?
License plate lights?
Tail light bulb holders are not too hard to find in good used condition, though you might need to repaint the reflectors to get best brightness. There are some chrome paints that work pretty well.
Complete tail light assemblies (lenses and frame) are scarce without some issue, either scratched or cracked lenses and the left side chrome on the frame tends to have bumps from the exhaust. Complete good ones are pricey.
There is a fellow in Australia that is making reproduction lenses but the pace has been slow. Stan is coordinating the purchase of these new lenses, but you'll need your own frames.
The thread is here:
http://www.e9coupe.com/forum/thread...ity-reproduction-tail-light-frame-lens.20987/
I don't know much about fog lights other than they were not put on US cars and my knowledge of license plate lights is equally limited.
Please refer to the realoem.com diagram to be more specific as to what you are looking for.
http://www.realoem.com/bmw/enUS/showparts?id=3435-USA-06-1971-E9-BMW-30CS&diagId=63_0514
Ian