I can help. Had this prob myself. The GTSt has 4 holes in the front bar OO OO in this config and to get the hardest 2 settings you have to have the suspension compressed, soooo jack it up, then put blocks or ramps under the wheels and presto, the link goes in.
As the man says, hope that helps
PS SK tha rear still has 2 holes but anyway, does this now mean the front has 16 settings or 10?