Heavy Duty External Cup Headset Forged chromoly lower cup 12mm Deep Cup 6061/T6 upper cup Super oversized japanese Sealed lower bearing FSA ACB 36/36 upper cartridge bearing Forged chromoly crown race Gyro compatible Laser etched aluminium top cap FSA Part Number 141-2005 Not sure if this is the one you need? Check out the handy FSA Headset ID Tool here http://www.fsaeasyheadset.com/