New Key Blank for the key code CC lock cylinders. OP11, OPCC, or 076R. Not for GT gas cap. Use key 12037B. Note: There were two different key blank styles installed in Opel GT's. We recommend purchasing blanks in pairs (buying both part #12037A and part #12037B) so you get one of each. A good idea is to also purchase a few extra, as spares. Or, you can also specify an individual type of key for your application: 12037A=Opel GT Doors and Ignition Key Code (CC) 12037B=Opel GT Doors, Ignition and GT Gas Caps Key Code (BB)