subarugenuineparts.com has a 20mm rear sway bar for my 2006 WRX Wagon for $85. It is under the menu in the SPT section (https://www.subarugenuineparts.com/product_info.php?cPath=33_68&products_id=1131). I don't remember the size of the stock sway bar.... thus 'am not sure this would be an...