This is the genuine Toyota OEM flywheel, identical to the one in a stock 6-speed Supra.
You should NEVER resurface the OEM flywheel, it MUST be replaced when changing out your clutch.
The OEM flywheel is a dual mass flywheel. Most flywheels are single mass and you can resurface them, but not so on a dual mass.
Dual mass flywheels have 2 flywheels built into 1, and in between them are springs which dampen the vibration of the V160.
Grinding grit from an attempted resurface will absolutely find its way into the internal section of your flywheel and destroy it from the inside out.