Who makes a good rear body inner panel for the 67 camaro?

[sunoco67]

Im needing to replace the rear body lower reinforcement panel on my 67 camaro.This panel is the one that welds to the frame rails and offers support to the outer rear body panel. The one i bought from a local supplier (labeled a goodmark part) does not fit at all. The rear body panel and quarter panels are all NOS stuff so I know their right. I have removed the original one because of some damage to it that happpened years ago and was not fixed. The quarter panels and rear body panel was replaced but I was never told the rear panel was damaged so it was not replaced then. I have seen one on Ebay be sold thru DR Classics and wondered if anybody has used one. These are made in the USA......

Thanks in advance.