Adjustable plate that allows the TH8 and TH8A gearboxes to be used as sequential gearboxes (+ / -).
Recommendations for testing or adjusting TH8A Shifter - Thrustmaster - Technical support website
TH8 RS Handbrake Plate with spring mod
Thrustmaster TH8 Sequential Knob 4060083 B&H Photo Video
Thrustmaster TH8 RS with Ferrari shift plate and gear knob