Yes that's me on track! Black Diamond rear brake discs drilled and grooved .Comes as a boxed pair left and right.
Now available without drill & Grooved choose the options
High-performance heat treated and phosphate coated disc easily outperforms and outlasts the stock disc. 240mm dia.
My choice for road and competition work match up with Black Diamond pads for best all round performance.
I tested Green Stuff pads against the Black Diamond and the Green Stuff ones  glazed up and started to break up and rapidly faded!!