I have the sound card without a case that uses the CM-108.
The old case that your design replaces does not hold the board.
Do you have a design that fits this case - https://www.amazon.com/MusRock-Drive-Free-External-Adapter-Required/dp/B0FTFSJ5JC/ref=sr_1_1?crid=6AZU12F3IWXD&dib=eyJ2IjoiMSJ9.ZrttttOAVqLlIIRmr5GwpSNrcTXqNtvK3xWMl3FwQAuU7pLo5CEj92Wd69ndlQDViMAgUp3amBe2z0_aQG7BYIr_esilQiNQREha_ytbUM-5VJQfJIaJI2PWkgpgHGDThHY1R5ViNd7fFOZcppR_k5AtcNTKkOoT7yXEw6duzV7CRKkUyaWKuuS799ALy3BalME0d16d_6HGanz_E43iJ4f9cZ_usLc2bbCPC80rof0DMlFvRvWWeWRr-JyiCQqhFTuCl3IqKx3UZ8-PfLr1Scfig2g1Pk0q8gkA8aaycek.n5bfgNAErKgriJA-eKxfzzDbTS7wCsliL5nRl1GLHMU&dib_tag=se&keywords=cm-108%2Busb%2Bsound%2Bdongle&qid=1779042513&s=electronics&sprefix=cm-108%2Busb%2Bsound%2Bdongle%2Celectronics%2C153&sr=1-1&th=1
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Just thanks for sharing !