Grain-it is what I used on my cabriolet. the process is supposedly the same as originally used on the Model A's. It takes a lot of practice to get the technique down, but it sure is satisfying to be able say you did it. Once you have practiced enough, it really is not hard to do, and the company has many videos on line to review. the cost is probably comparable to having someone else do a less authentic hand graining job.
a practice panel
a practice stamped panel