Attention 06 STi owners - we have run into a situation where Subaru has used the 04/05 linkage on some of the 06 STis. If your control rod/linkage core is GOLD in color then you need the 04/05 kit. If your control rod/linkage core is dark green in color you need the 06 kit.
So what to do? Well, how about this - new bushings. Not just new bushings, but bushings that fit (which is always a good thing). In fact it turns out that when Subaru changed the size they made them the same across all the models - both the 6MT AND the 5MT. So I guess Subaru made up for the bummer because these will now fit all the 06 manual transmission Subarus.
So now you say, "Hey guys, that's great and all, but I'm not really familiar with them. What do they do?" Seems like a fair enough question to us, so let me answer it for you.