Like your Z, this site is always underconstruction. :-)
Subtle Z™ Widebody Fender Kit
The 940Z ™ is the same size as the Subtle Z™ (1.5" wider than stock), but with a slightly different look that reflects the Porsche 944 lines.
These fender braces are used at the rear of the fenders (just in front of the doors) to help stabilize the shape and position of this area.