I found Deeluxe's website which says the stifness for Indy:8, Suzuka:6, 325T:6, and 225T:4.
http://www.deeluxe.com/2006/en/products/alpine/3.html
Thanks friends. I think I have decided to buy Suzuka.
Some people say buckles get broken easily. Before Deeluxe stop producing boots and parts, I want to keep some parts.
Anybody has suggestion which parts other than soles?