I wouldn't buy anything like that from J.C. Whitney. In fact, I wouldn't buy anything from them. I bought a so-called moulded carpet from them for a '69 Buick I owned and the quality and fit...well, in short, it was just absolute junk. Not just the fit but total quality of the product. I've heard the same from many, many people in the car hobby since then.
If you want a dash cap instead of a completely restored dash, I'd try these folks-
http://www.dashcaps.com