This F-705G angle goes underneath the bulkhead cross member. I decided to notch out the area where the side skin rivets enter. Van's instructions have you wait to install this critical angle until you have riveted on the side skin and top skin. I don't want to wait, since the canopy frame needs to have this installed. It's another chicken/egg problem. By notching some extra space behind the rivets, I'm hoping I'll be able to buck these later with solid rivets. If that doesn't work, then I can use pull rivets on these three.