Beard harness x4 for stock seats?

Hello all,

Contemplating Beard 4 point harnesses for my new RZR 4 900.
I like the look of these due to having automotive style buckles. Question is, are they hard to attach and remove if you need to remove seat? Do they attach to the handrail in the back of the front seats? Planning to keep stock seats. Is there a 3" model out there with auto style buckle?