[jager911]

I'm installing Sparco Pro Adv Halo seats into my 74, pictured below.
Part of my concern is adding some head safety, I read the downsides getting out of the car in a hurry through the window. I have a removable steering wheel and I'm well practiced at climbing through the window as I switched to an open trailer last year and the fender gets in the way of the low door.

Looking for feedback on ease of use primarily on the track, are they claustrophobic?
I don't have a right side mirror now and rely on a large convex mirror inside.
For very limited street use, the occasional Sunday autox, I realize there is a potential for blind spot but want to hear from someone who's actually using these seats and pros/cons.

Also, looking for feedback on how to install on stock seat mounts, I'm thinking of using double-locking sliders with side mounts, do the generic Sparco sliders work?
I have installed other seats, Kirkeys. OMPs etc so I understand the principles, I would like to know which specific parts to buy to avoid returns. Thanks!