I have a YNZ harness in my '46 and was happy with it. I also used one in my '59. For my '50 3800 I purchased a harness from Brillman.
https://brillman.com/I would have a hard time believing there is a more original appearing harness than this. The attention to detail is impressive. I have not installed it yet but hope to soon. I am sure I paid less than the number shown above for the YNZ harness as well. I will look it up when I get home from work.