11 GT OEM Strut Tower Brace
 

Will it bolt up to the stock mounts on an '06 GT?

UB10

I don't know for sure but if I had to bet on it - I'd say yes. The only thing I'd worry about is if it's too high in the center for an '06 hood to close properly. Does anyone know if the 5.0 engine sit higher than the old 4.6?

There are plenty of options out there for strut tower braces. Is it the appearance of the one on the '11 or is it just that you have one available to you?

Hood clearance may be a problem.

It won't clear the hood.