I am in the same boat and need both sides. The quarter panels ALL come from Tiawan and I am told they are made of lighter gage metal. I sure wish someone like AMD would step up and make the patch panels and also the vertical part of the trunk extension which also usually needs to be replaced.
I have called them and asked if they could get them for me. They never called back with the reply but they did say the ones they could get are body thickness.