Found this on a subaru forum.
Normally these go for $200+ each so this could be a pricing error.
Thanks to jmoore626 below, here are the compatible model details.
Year Make Model Fitment Notes
2008 Subaru Legacy 3.0 R Limited / GT Limited / GT spec.B
2007 Subaru Legacy GT Limited Wagon; 2.5i / GT spec.B
2006 Subaru Legacy GT Wagon; GT spec.B
2005 Subaru Legacy Wagon; I / Limited Sedan
2004 Subaru Legacy GT Wagon
2003 Subaru Legacy GT Wagon
T3 slotted disc rotors
Lifetime Warranty when supplied and fitted by MRT Performance
For more information see http://www.mrtperformance.com.au/manufacturers/dba
NOTE: Price is per rotor