Thanks for all the input. I did measure my sit bones by taking a piece of paper and placing it on about 1/2" of foam rubber. I then sat on the paper like shown in the above diagram and then measured from the center of the impressions. This gave a measure of 110mm one time and 120 mm another time. It is difficult to determine the exact center of the impressions.

From the scale above and my riding position it looks like the 143 mm saddle would be a good starting point. My saddle is around 170mm edge to edge but it has soft foam on it which is probably causing my discomfort after about 1 hour of riding.

Thanks again.