The first series bikes had side (or battery) covers that had pins on the forward and aft ends and a support with a ring opening at the third (bottom) point, the first two fitting in grommets in the tank and frame and the bottom ones sliding over a pin with a rubber bush.
Later ones had a pin aft that slid in the aft end fairing with a little hook like contraption at the bottom that clamped the rubber bush on the frame pin. The forward one was still a pin that fitted in a grommet in the tank. I assume that after that another few changes have been made :-)