If you are looking for "original", I think you have the wrong wheels. I was a Chevrolet mechanic and parts man from 68-73. The best I remember is they didn't come uot with 16.5s until 69 or 70. Probably the reason you have 16.5s is everyone used them for years and those tires were cheaper(maybe) and for sure easier to find. Many people changed wheels for that reason. Hope this helps Joe