This is the hidden (but important!) wiper linkage for the 2002-2003 Impreza/WRX. Over time the joints on this part wear out, and your wipers won't work well. Replace it to get them wiping like new.
Part 86521A on diagram.
Fits all 2002-2003 LEFT-HAND-DRIVE (LHD) Subaru Impreza and WRX. Does not fit RHD cars.