EFX 2-Channel RCA Patch Cables (3-foot) Delta Series twisted pair multi-core RCA patch cables at Crutchfield
Amazon.com: Acouto RCA Adapter Audio Stereo Cable,8 Pin Mini ISO RCA Cable Adapter for Bla‑Punkt Compact Disc Changer Car Stereo Line : Electronics
20-Pin Plug Car Stereo Radio RCA Output Wire Aux-in Adapter Cable + Microphone - Walmart.com
Sky High Car Audio 20ft Premium 4-Channel RCA
Sky High Car Audio Premium 2-Channel RCA 1.5ft-20ft
Amazon.com: Hikity Android Car Stereo Radio RCA Cable Wire Harness Cord Assembly with 9 RCA Female Plugs for Car Audio Video Player Support External Mic SUB : Electronics