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You can really use any brand/kind of spark plug for your Opel engine that is made for it. But I would recommend the Bosch Platinum Plus. These are a little more expensive than most others, but worth the little bit of extra money. Also note that you need to set the gap according to the ignition system you have (stock points, petronix, compufire, etc.) Recommended gap settings can be found in other forums.
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