First off, if that bike you have there is a unmolested, unrestored survivor, that is absolutely incredible!!! It looks brand new, I'd love to hear the story of how you acquired it. I'm a huge 72 lover as well. By the sounds of it, you are a purist, and have an excellent bike to use for an example and reference along with period correctness. That being said, I think NOS parts are going to be your best option to satisfy your attention to factory original detail. As you say, aftermarket reproduction parts are nice, but never exactly how Honda manufactured them. Budget friendly for guys like me!