Just wanted to share, I was able to find replacement hooks for my First 38's curtains at Amazon. They fit perfectly. Here's the link:
http://www.amazon.com/gp/product/B007RHVGJI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1
http://www.amazon.com/gp/product/B007RHVGJI/ref=oh_details_o01_s00_i00?ie=UTF8&psc=1