New key blank that fits Opel GT. Note: There were two different key blank styles installed in Opel GT's, and 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 (11) 12037B=Opel GT Doors and GT Gas Caps (19)