This Comfort Strap is designs for the HD-6x0 series headphones.
This should fit on the HD-600, HD-580, HD-6XX, HD-650 and the HD-58X.
Reach out on our support discord if you have any problems!
You can purchase a premade version here on our etsy page!
Do note that you will still have to install it yourself, though all necessary parts will be 3d printed before shipping.