Steven Porter asked me to show him what the change that actually is in the mounts for the GSL-SE RX-7.  Mazda says in the 1984 RX-7 Brochure, “GSL-SE lower control arms are lowered 20mm to improve road holding and grip.”  Other than that one sentence, Mazda doesn’t give any more information.  I’ve gone ahead and taken pictured of the standard RX-7 lower control arm mounts and the GSL-SE mounts.

The mount show below is on a 1983 GS.  It is the standard mount on all first generation RX-7’s.  The picture shows that the bottom of the mount is level with the floor. The bolt sits at about 50mm and the bottom of the mount is at 80mm.

The GSL-SE mount does not sit level with the floor, it flairs down.  The bolt sits at about 70mm and the bottom of the mount is at 100mm. Overall it is a very slight change in the suspension geometry but it does actually make a difference in the car.

I took two extra pictured of the GSL-SE mounts for reference.