The Prothane rear sway bar bushing for 2004 Subaru WRX/STI is a 19mm replacement bushing finished in black for the rear stabilizer bar. It specifies the rear position and 19mm dimension for that model year, providing a straightforward identification for owners replacing the WRX/STI's rear sway bar mounting bushing with the matching size and color.
Prothane 04 Subaru WRX/STI Rear Sway Bar Bushings - 19mm - Black