Glute Ham Raise Wall Anchor

I saw in you Killer Leg Workout an adjustable foot anchor  attached to the wall for glute ham raises. Do you know where you could purchase  this?

Thanks 

I think that it is something like that

https://www.amazon.com/Titan-Foot-Roller-Attachment-Power/dp/B07BR64GJK/ref=sr_1_33_sspa?ie=UTF8&qid=1542231287&sr=8-33-spons&keywords=glute+ham+raise&psc=1