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
dba42650s
4000 SERIES
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
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