What size of gear and rack to use for the FITec continuous rotation micro servo?

I am planning on using the FITec continuous rotation micro servo (product # RB-Fit-02) for my project. Site link: robotshop.com/productinfo.aspx?pc=RB-Fit-02&lang=en-US

I need to use a rack and pinion system with this micro servo. What is the size of gear that I can use to mount onto the micro servo? Do you sell gears and racks specifically for this servo? If I can buy everything I need from Robotshop.com, it will guarantee everything will fit correctly, which is the most crucial part of my project.

Thanks in advance for your help! I’m still new to robot-building!

Unfortunately we are not aware of any gears which fit this servo - it’s a specific spline (not Hitec or Futaba) and the manufacturer has not branched out to anything but hobby servos.