3.5mm to 6.3mm Jack Adapter Mono – KOMA Elektronik
Amazon.com: Sennheiser Genuine Adapter Cable Female 1/4" 6.3mm to Male 1/8" 3.5mm Plug for Headphones : Electronics
Furutech F 63-Sg DIY Connector adaptor
MUSIC STORE Adaptor 6.3mm Jack Socket To 3.5mm Jack Plug Stereo | MUSIC STORE professional
Amazon.com: Mobi Lock 3.5mm Plug to 6.35mm Socket (Pack of 2) 1/8 to 1/4 inch Stereo Audio Jack Adapter | Connects Devices with 3.5mm Port to Your Amplifiers, Guitar, Piano, Speakers &
HQ Jack adapter (3.5mm female to 6.3mm male)
Cable Standard 6.3mm Jack to 3.5mm Adaptor – EZ TATTOO SUPPLY