I'm guessing the 6E option is the correct one but as Steve says the other may also fit.
Just for fun, I can try designing it for 3D printing if I can get enough information about dimensions.
I have FD and PD in the family but not a GD, so I don't have a physical exemplar for direct measurement.
The more I look, the more differences I find, such as edge lugs in different places. However, I don't think these small differences will matter so long as the overall dimensions are the same.
You could ask the sellers to provide you with *precise* dimensions and see whether the cover shapes are any different in size.