Not sure about vinyl covering… I have a ‘46 Mercury and I started with pretty complete original car with an intact interior. My original kick panels were cardboard and were a blue/grey color. They weren’t really a pebble grain as I recall, but they did have some sort of fine pattern, like a window screen effect, only much smaller. I replicated it as best I could with fairly smooth black panel board that I fogged on a light coat of SEM grey paint to coordinate with the grey/green upholstery cloth. The end result was quite close to the original look. I think Fords had more of a brown or blue/grey fabric, so kick panels may be a different color. The vertical retainer channels were painted the main dash color. Zoom in to see the kick panels.