I had a Librands rollbar fitted at Williams.
I forgot at the time about my tonneau cover that wouldn't fit!
Returned a while later for them to modify it for the rollbar. I thought of pockets for the headrests but the rollbar meant they would not be easy to use.
Good job done on the tonneau cover.

I have to remove headrests but wax the support bar so it slides better for removal/refit. No danger of sudden release and a flying headrest!