The stainless steel rear axleback hangers are a great investment. Included in this package are two hangers. You need a total of 4 if you want to convert your rear and front hangers to stainless. Not only will they not rust like the factory rear & front hangers but they will help assure an easy installation. For a limited time in late 2007 and early 2008 Ford use a exhaust bracket that made aftermarket axleback fitment difficult. This Pypes bracket can cure many of those installation issues and is compatible with aftermarket performance axleback system. These will work on all 05-09 Mustangs if you want to improve the quality of your muffler hangers.