I've got a pair of these myself - the ones I have are "E" marked so are road legal over here in the UK. They are Left/Right adjustable via a lever by the bulb holder.
Hope this help a bit. I have no idea what the letters stand for though.
Hi, mine came off ebay from a seller in Lebanon (Middle East not USA). I had no problems dealing with him. He regularly lists these and non TP21SP marked ones as well for $299(US) I think.