My GDI came with standard Spax, and they were actually quite good. I now use Spax Krypton adjustables on my Roadster, which work well, on a soft setting.
If the long bolts and spacers are for the rear, the geometry as built is compromised, and the bushes take the strain. Fitting a spacer washer on the top bolt eases the conflict. Some bolts were fitted heads against the plywood panel, so will require carpentry to replace them.
