http://parts.globalvr.com/Search for part # 990-0040-01
You have to call to order it. Expect it to be expensive.
It says there is a core charge now that you'll get back when you send them your old board.
Another company was using them to make expensive home wheels.
They might be trying to discourage people without Global VR machines from buying them, so they'll have parts available to service the machines they've sold.
According to the description, it was used in Need for Speed GT, Need for Speed Underground, Need for Speed Carbon, NASCAR Racing, & Twisted - Nitro Stunt Racing.
So look for used parts from those games. (Sega NASCAR Racing is different from Global VR NASCAR Racing btw)
Someday I'll get back to trying to improve the logitech hack.
My latest theory is that if a smaller gear is put on the feedback motor, it might not overshoot the centering.
The current gear is 1/5" pitch, 16 teeth, 3/8" bore.
I haven't found smaller gears with the correct bore yet, but I haven't put a ton of time into looking either.