My bike on my Bikecentennial ride in 1976 came with, I am pretty sure, was a pletcher rear rack. It broke as i entered Wyoming from the east, and I patched it up, and could not replace it until West Yellowstone, The new one was/is a Jim Blackburn, near as I can remember after 45 years. much better rack. My bike was/is a 1975 Fuji Trans America touring bike, still have it, it was named after the cross country route. It is a rare model, cost about $350 then, a little less than custom bikes then.