Jack,
Here is a picture of my '71 with the quarter panel removed as a reference for you. I see the 1" higher lip.
I have the new ...001 40 GRV bar that you received. I should know in a week or two if my body shop has similar problems.
By the way, are you replacing the closing plates 911 501 203 40 and ...204 40 that go on the outside? I think they may help locate the bar. I got them from Gary at Parts Obsolete recently (NLA from Porsche). The plate is removed in this photo.
I hope this helps...
Kirk
PS: What are you doing about the pin receivers? Can they be salvaged from the old bar?