The FC3S stock steering wheel diameter is 380mm and offset (upward) by 2mm.  Popular aftermarket steering wheels are either 350mm or 320mm in diameter (centered).  We recommend to keep with the 350mm (or larger) diameter for all vehicles, but this is especially true for manual steering FC's.  Those with power steering can go down to a 320mm unit, but keep in mind this will block a lot of the instrument cluster display.  Even with a 350mm unit, sometimes the top part of the instrument cluster can be blocked; a steering wheel hub spacer can be installed so that you can see the entire instrument cluster.  Popular aftermarket steering wheel brands are MOMO, Sparco, and Nardi / Personal.  You'll need a hub adapter (from the appropriate manufacturer) to mount these aftermarket steering wheels to your FC.
Steering wheel spacer page

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