Crazy Installer: What IOS?

I'm just wondering, which IOS should I use for installers made with Crazy Installer? It gives me a choice, but I don't know which one I should use. I know the forwarder installers for the three emulators as well as for WiiMC use 58. Should I use IOS58, or should I use a different one? I'm on 4.3, so I have IOS58, and I don't have any cIOS.

The IOS used for the installer must be an IOS that accepts fake signatures i.e. either a cIOS or a patched IOS. Regular IOS will not work.