you can either type of top mount to a mk3, and either type of mount will fit to any shock. just a case of making sure the top mounts and upper spring cups match, plus you get the right diameter upper cups to match the springs.
but since its just shocks you're asking about then they're a direct fit, just swap your old stuff over but with new top mounts as said. i would also put new bump stops and upper rubber spring seats on the backs as well, the front bump stops are usually fine to reuse
