Where are these from?

Here's the floor braces and seats installed,

The seats look great!! How is the seating position? I haven't had a chance to test fit anything but I had just ballparked (in my head) that I was going to need seat brackets between like 4"-6" tall. I grew up driving vans and trucks so I feel more comfortable in a more upright position but I am going to let the car tell me where it wants me to sit