Interesting that it didn’t fit your NA6. What seat brackets are you using?
I’ll post up my fitment tests once I get my seat and cage installed. I’m planning on using the PCI race bracket and Advanced Auto deluxe cage with my seat: https://www.pci-raci...5-mazda-mx-5-2/
No brackets, just dropping the bare seat in. But I had to stop by the shop today and spent a few minutes taking a closer look. Interference of the halo with the cage limits how far back, or leaned back, it can go, and the front width of the seat limits how far forward it can go. So with the tail of the seat all but touching the floor (absolutely necessary for my height) there is exactly one position the seat can go. The front most edge is about 1/4” behind the front edge of that stock cross support and wedged slightly crooked between the left door sill and the front of the tunnel notch. That’s it, not even enough play to wiggle it facing straight. With a BFH deftly applied to the interior it might be able to straighten but I’m not sure I’d be able to get it in there with mounting brackets attached. Regardless, it’s too far forward for me but I may be putting a short driver in that car so I’ll mess with it a little more when time allows.
I’m not faulting the seat, there’s just not enough room for a halo seat to go far back with that cage. If the seat were an inch narrower I’d still fit in it and could at least get it straight in the car. That’s one advantage of aluminum seats, the come in finer increments and there is very little extra width since strength and rigidity are from creases and beads, and in a pinch they can be tweaked slightly.