Skip Gibbs or John Roberts are pretty good resources for Warlock info also - http://www.skipgibbs.biz/ http://www.lilredexpress.org/ http://www.lilreddad.com/.

We carry their books as well as many other parts - http://www.dodgeconnection.com/page/page/2822500.htm

As for your questions - early 78's would have the clear lens as carry overs and then they switched to Amber lens.

Originally the bed strips and wood were painted body color but many people swapped them out for polished strip and clear wood early on so they appear "original" now.