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If your 2003 mustang's car stereo has an Auxiliary input that you can easily connect the Onyx EZR to your car stereo with the included 3.5mm (1/8in) stereo cable. If no Aux input is available then you will need the optional FM Direct Adapter model # FMDA25 to connect the Onyx EZR to you car stereo's FM antenna input port. The FMDA25 is available at this link: https://www.bestbuy.com/site/siriusxm-fm-direct-adapter-for-satellite-radios-black/8116585.p?skuId=8116585
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