Sennheiser Adaptor Jack 6.3mm(F) to 3.5mm(M) | Headphone Adaptor | Richer Sounds
AV:Link AV Link 3.5mm Stereo Plug to 2 x 6.3mm Mono Plugs Lead - Accessories from Kenny's Music UK
Doepfer Adapter Cable 6.3/3.5 mm – Thomann UK
3.5mm Stereo Jack - 2x 6.3mm Mono Jack | getinthemix.com
6.35mm Plug to 3.5mm Socket (Pack of 2) 1/4 to 1/8 inch Stereo Audio Jack Adapter | Converts Audio from Amplifiers, Guitar, Piano, Drums, Speakers & Mic that use 6.35mm to 3.5mm