Esqueleto based the shape on the original M2-1028 seat and has been made especially for the NA & NB Miata (1989-2005). It comes with removeable back and bottom cushions for extra comfort. They made it to be 100% sure there are no modification nor interference when installing it in the 2 seater. The shell is made out of low-rebound urethane for great comfort and support to the entire body. It’s made to reduce long-distance driving fatigue and still be comfortable. By using the dedicated seat side brackets, you can install the seats onto your OEM seat rails without any modification. Esqueleto Type 2 Seat (Type M2-1028) should be ordered at REV9 Autosport https://rev9autosport.com/esqueleto-type-2-seat-type-m2-1028.html as they provide the best service and speed we've seen so far!