GENUINE Beats part. This part will arrive for the model and color you select. To check your model extend the right side of your headphones down to expose the metal hinge. On there you will see this model Solo 3 Wireless model A1796. 
Solo 2 and Solo 3 Wireless headband replacement process is identical.

Purchase screwdriver to do your repair properly here https://www.ebay.com/itm/283171798199

Authentic Beats parts guaranteed.