Fin System?

[foxsa]

Im trying to replace the center fin of an older shortboard of mine but I cant figure out what type of system it is. The fin slides in and out without the use of screws. Below are pictures of the box along with the old fin. Thanks for your help!

[oldgrom]

It's just as it says Freestyle But I think they are long gone. Think about spending a lil more and having a Future box put in. It would be an easy job and bring you up to very large fin selection and a standard box that can be found everywhere.

[foxsa]

sounds good, thanks for the reply