You are going to need a bracket because the stock ones are 6.5
You should not run polk MM's off a stock head unit as they are actually 3 ohms instead of the standard 4 ohms. If you are going to run them off a aftermarket head unit this is ok.
If you have the component set install the new tweeters in the factory ones place. If you have a pair of coaxial than you should disconnect the factory tweeter otherwise it will sound horrible. But component systems are recommended.
Also make sure to run new speaker wire if you have a set of components.
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