2 Pairs (4PCS) New Replacement Professional Headphone Speaker Parts for Bose QC15 QC3 40mm Drivers Headphones 32 Ohm Speaker Unit - China Headphone and Speaker price | Made-in-China.com
Bose QuietControl 30 wireless headphones - メルカリ
Replacement speakers parts Speaker Driver for Bose quietcomfort QC2 QC15 QC25 QC35 QC3 AE2 OE2 40 mm drivers headphones 32 ohm|Earphone Accessories| - AliExpress
Koss KPH30i drivers + Bose QC35 - could this work? : r/headphones