The original comments and questions were referencing dimensional differences of the brace without any dimensions of the brace called out. Other comments were included, again without measurements, all addressed to the export brace.
Two inches too wide at the towers and 1 inch too long at the firewall.
Not as heavy as original Ford either, not that it matters since it has no hope of fitting.
Install attempt was by a renowned frame and alignment shop that has a vintage Mustang enthusiast/tradesman in-house.
The 66 convertible has never been crashed, has original sheetmetal, and is on spec with regards to unibody, got everything checked out.
The vehicle in question was more or less certified as not at fault, and, by extension, the brace was identified as defective.
Most of the additional posts addressed an installed brace with measurements of cars with the brace installed, or in process. An installed brace does not address the original question about Scott Drake sold export braces.
If the original poster is willing and able to make the same measurements of an uninstalled brace as I presented in my sketch, a better idea can be made as to what the problem is.
Jim