I'm moving maybe 500 of the incorrect lh chrome lug nuts a year ....they are steady sellers at $2 ea Canadian.Left hand studs are getting harder to find...most of my suppliers are running out of stock.Left hand studs for two piece rotors are getting real tuff to find.I would not make a right hand thread lug nut with a L marking ...it will not only confuse the issue but it will lead to broken parts. I think that all the hard core #'s customers I have would not even consider such a part but would rather spend the extra dough on a correct stud.And as mentioned above there are thousands of lh stud Mopars still out there....you gotta figure C bodys alone outnumber the E's by a 3 or 4 to one.
Best bet would be to make the lug nuts and studs in LH.