We often find these bushes considerably worn, causing excessive play in the shifter which ruins the feel of the gear shift. A pair of these bushes can cure the play and tighten the shift up, dramatically improving the feel as you move through the gears.
We've found these suitable for all 6 speed STi transmissions, including Impreza, Forester and Legacy models. Order 4 to replace both parts of the linkage (see highlighted image.)