Thanks Jim. I did the angles I believe you're talking about... they were aluminum. I wonder if these were designed to go along the lower corner (at a right angle to the aluminum ones). Oh well, I had no problem bringing the fabric around & attaching it to the corner fuselage tube. I sure don't think I saw anything in the manual about them.
Geowitz - I'm not sure how it is on other models, but on the 7 SS the return springs attach to tabs welded to the front bottom cross tube on the fuselage... no additional stiffness required on the firewall in that area.
Thanks all.