Harvest Gold? Do you still have avocado appliances as well? Actually the advise to call Kohler is spot on. I highly doubt they have it. I would keep an eye out on EBAY for vintage products and you may be lucky. If your sold on the color you may spray paint a standard one and then clear over the top to protect it.
Thanks for the hinge number. It looks the same as mine. Of course my plumber wanted me to spend another bundle after 15 months. Now I need to find it in Canada