I will start with the easy answer. Yes, the left hand lugs had a "L" stamped on the side of them. No notches in the lugs I know of.
I can say without a doubt the finish on H wheels was not a "gloss" finish. Semi gloss at best. These wheels came from the M5 factory with a black paint on them. The finish would have then been effected by the cure on any given day. I have seen many different levels of finish on original M5/9 wheels, but none "gloss"
The idea was to keep the cost down as Chrysler knew people were going to run aftermarket wheels. Hence the reason these are so hard to come by, people tossed the originals.
I have a survivor A12 in my shop with it's original H wheels and lugs. I will post some pictures later today. There really is no debate, at least in my eyes.
D