As far as the style, the top one is the usual C2 style clip. There was also an earlier one you can see in old pictures of like the C2 and M2 when they first came out.
The reversible one at the bottom is the one that comes on the Surefire LX2. I don't think the C2 ever came with that clip.
That being said, it's possible these are Lumens Factory replacements. They look exactly like the OEM Surefires.