I think Lighthound needs to redo their webpage for easier navigation. I have ordered from there 3 times now and sometimes I find what I'm looking for by mistake.
Mini-Modder, the KT1 or KT2 is for the C or M series Surefire lights. This is supposed to increase the throw and even brightness with the HOLA.
If you get stuck, abd cannot find one easily, I have a new (opened) KT2 in Black that I will sell you. It should have been in my sale last week but I forgot it until I was looking for a box today.