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Thank you for your question. The WB-300 Wall Bracket will not work with a Bose 321 system. This was engineered to work with the SoundTouch 300 soundbar specifically. We'd recommend reaching out to your local Bose Technical Support Team for compatible wall mounting brackets for your 321 system. Regional contact information can be found at https://global.bose.com . After selecting your region, navigate to the top-right corner of the page and select 'Support'. Then, scroll to the bottom of the page and select 'Contact Us'. Thank you.
Sorry, there was a problem. Please try again later.No..they are very custom designed to replace the rectangular rubber feet of only the Soundtouch 300 soundbar. Now they would *possibly* support the 321 speakers if you somehow already have them free of charge, but I would recommend instead buying the custom supports for the 321 speakers. (I have the Soundtouch 300 with brackets and have owned a 321 in the past)
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