Hello
I also bought the one in the bag and I confirm that it is of poor quality (especially the brake fluid reservoir) but must work, but I preferred to buy from superformance.co.uk a very good OEM copy ref: 308 Right Hand Drive 30806095 (£ 269.95) that I mounted on my pantera and that works very well. You just have to get your old brake fluid reservoir and put it on the new brake master cylinder.