So that has a release higher up on the side? Mine is on the hinge. I don't think it changes anything on the cover other than putting holes in the side for your hinge and realese.
That looks completely different! Pivot point is way higher on yours. Base may still be the same, but I'd bet the lower section of the seatbacks is gonna be significantly different
Looking closer, the rear part of the base would need to be made different as well.. where the 'hinge base' comes through..