Short throw shifter issues


So I have bought 2 new short throw shifters and neither worked....
The newest one is:

I have a 1990 GT4 Narrowbody with the metal shifter cage, is that the issue? As per Superklasses return policy I might not be able to return it and as such might just have to find a way to get it in, if so is that only a 1993 cage install away? Does anyone have these issues. Anyone with a metal cage and short throw shifter?

Thank you!