On some early 997 models (pre 2006) there are no supporting lugs for the outer bushings. For these models use PFR57-508 for the outer bushings & PFR57-509 for the inner bushings. For cars with supporting lugs on the outer bushings, use x2 PFR57-509.

This part fits the following models:
Porsche
911
997 GT2 / GT3 / RS (2010-2012)
997 (2005-2012)
996 (1997-2005)