Oct 6, 2019
Hi Leead Moyal,
Thanks for posting and welcome to the Bose Community. I am sorry to hear that you have lost your remote and would love to assist you with this!
Only the U321II remote will work with this system and we do still have these in stock (Bose USA) if this is something that you wish to purchase the part number is 288579-301 and you will need to reach out to customer support in your region to purchase this part. You can find the support team in your region located here.
If you have any other questions regarding your 321 system please do let us know and thank you @Xyz987 for your contribution to this thread!
Hector B - Community Support