Oooopps
Well, it is very interesting what one finds when one looks closely. Bob and Roscoe were correct, there is an inlet in the center of the back part or the caliper, just as in Roscoe's picture.
The reason I said "look closely" is that the billet calipers are black and Wilwood put a round black vinyl sticker over the inlet opening. I had never bothered to look at that sticker until you guys told me where the opening should be. With the inlet on one side, it is obvious that the caliper mst have an internal crossover. Very sorry about the stupid question.
I have to assume from the original responses to my questions that all of the "for racing only" stuff on the boxes and the installation instructions is strickly for legal purposes. The pads supplied should be OK for the street, at least to start with.
Many thanks guys,
Wayne