Amazon.com: ATC® 5 Piece Professional Converter Adapter 3.5mm 1/8 Male to 6.35mm 1/4 Female Mono Audio Mic Plug Adapter Jack Microphone Accessory : Musical Instruments
ATC 422AR Series Adapter Plate, 1/8 DIN To 1/16 DIN Cutout, 422AR-020-0300 - FLW, Inc.