Have you tried to get one from FR? I had my FR3 in for some warranty work, and while it was there I told my dealer about the shower curtain issues everyone was having and that in some cases, FR was replacing them. By the time the dealer contacted FR, mine was out of warranty, but FR said for "customer service relations" they would send the dealer the shower door to install. FR has been really good at fixing most, if not all, the issues that have come up with my FR3 and has worked with my dealer with no problems. I also told my dealer about the problem toilets in the 2014 FR3, and they contacted dometic, and they sent a new toilet.
This forum has been great for finding common problems, and its where I got all my info to tell the dealer. Great Forum