HI, I was looking for what I recently found out was referred to as 'the 4 sisters head' since Nana, Megu, Kira and Sara are all the same mold just different make up. Forgive me for all my questions: Do these come in pureskin and old skin? Also I am a little confused about the numbers, should I be looking for a f01 if I want a Megu sd10? Or if I happen to see a f05 ( if that is even right) should I get that one since its the same? acck I am sorry for all the questions. Its just last year I made a mistake and bought a full choice head and I didnt know that they had updated it and even though they were the same fcs numbers I was in for a big surpise and was very bummed ! so I dont want to make the same mistake again..