67 Barracuda Fastback Rear Panel Question

Have a 67 Fastback. The car came with the left rear panel removed.
Its a triangular panel with a cork type insulation on the back and a thin chrome
trim piece. Problem is there are no fasteners. How does this panel attach? Some
kind of screws and or clips I image.
Any help on what sizes they are, where to get etc. would be appreciated