If you want to change your T300 rim to GT3 you have a perfect chance to do it., This package contains components that can help to make your own mod
Aluminium and Alcantara F1 Open Wheel Mod for Thrustmaster
Thrustmaster T300RS T300GT Racing 13Inch 33cm Steering Wheel Mod DIY(carbon fiber,suede)
MOD - L-Style GT3 rim for T300 GTE – Acelith Design Sim Racing
Thrustmaster - Ferrari F1 Edition Racing Wheel for Xbox One
Thrustmaster T300RS T300GT Racing 13Inch 33cm Steering Wheel Mod DIY(carbon fiber,suede)
TSS HANDBRAKE Sparco Mod +
PLEASE READ BEFORE PURCHASE!!!!!!!!!!!, Wheel rim modification for Thrustmaster T300 RS/GT & 599 Ferrari ONLY , (F1 & 650S GT3 style), Real carbon
F1 & 650S GT3 style Thrustmaster T300 RS/GT wheel mod
T500RS custom GT wheel mod + Optional parts
Thrustmaster t300 F1 mod – GRD3D
MVH Studios GT Wheel Mod for Logitech G29/G923/G920 Playstation Xbox
Black Version F1 Open Wheel Mod for Thrustmaster T300
Best Logitech Carbon Fiber Wheel Mod - F1/Formula, GT3