FITS ALL CT90'S ATC90'S Thread Size: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Resistor: No Reach: 12.7MM / 1/2" Hex Size: 18mm Terminal Type: Threaded Stud Overall Height: ISO Gap: .028" (0.7mm) D8HA @ D6HA = NOW DR6HS CT90 ATC90 ATC110 "HOT" SPARK PLUG 7/19W (D6HA) temp out of stockD6HA = DR6HS - SAME PLUG ONLY NOW RESISTOR Thread Size: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Resistor: No Reach: 12.7MM / 1/2" Hex Size: 18mm Terminal Type: Threaded Stud Overall Height: ISO Gap: .028" (0.7mm) DR6HS "HOT"