68 Barracuda rocker spear removal/installation

Anybody have instructions on the proper way to remove the spears from a 68 Barracuda?
To be precise, I am wondering if they slide on from the front until they meet the gill moulding, or do they snap over the plastic clips?
All of these pieces are expensive to replace, so I want to be sure I do it right and not mess anything up. I have plenty of mechanical experience, but zero body experience.
Thanks to anybody that can help!!