Gentlemen,
Thank you all for your replies. You have all provided me with the detailed information that I need to make a decision on seat belts. This thread will serve others very well in the future too, regarding seat belts and three-point shoulder harness installation in AD trucks. Since my '47 doesn't have any seat belts, adding them will be an improvement none the less. I'm not going the three-point harness route since I'm built so close to the ground and the location of the shoulder harness anchor point will end up too high. I'll be installing lap belts. Juliano's is sending me some color samples. I plan on using the aviation-type buckles.
Thanks again for the great info.........