That looks like a normal rack that the poster bent out to clear the caliper.
Lots of companies make disc-compatible racks:
Topeak® Cycling Accessories ? Products - Racks
Racks « Products « Axiom Performance Gear
Racks
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Brompton S6L/S2E-X/M6L-X/S12 T Line
