Try this website below. I just ordered a inner fender for my 70 gs because it had a little rust on the passenger side from the battery acid I guess. The autobody guy said it would be cheaper to just replace it than to fix it. http://www.thepartsplaceinc.com/
I know that Automotive Metal Direct are reproducing only right side at this time. Unfortunately I also need the left side too.
do you want a correct 70 left inner fender or would 71-72 work for you too. there is a cosmetic difference in them.