2006 Cadillac DTS w/RPO Code J55 (Heavy Duty Power Brakes); Bore: 57 mm Position: Rear;. 2007 Cadillac DTS EngineVIN: 9; w/RPO Code J55 (Heavy Duty Power Brakes); Bore: 57 mm Position: Rear;. 2007 Cadillac DTS Submodel: Base;EngineVIN: Y; w/RPO Code J55 (Heavy Duty Power Brakes); Bore: 57 mm Position: Rear;.