The latest design from Steven's Aero Model are type "00". These laser-cut ply mounts are the ultimate in lightweight mounting for GWS-type stick-mount models.  They fit S400 Direct, AXI 22 Series, Mega 16 Series, and many other motors with 28mm max diameter and 16 mount spacing.

fits 10x10mm sticks

Most GWS kits come with two mounting locations for the stick.  Pictured on left below is the setup for EPS Geared.  To have the shaft position come out the same with SAM mount, move the stick to the lower location, as seen on right below.