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USB AUX Installation Block Switch Adapter for VW RCD RNS RNS RCD 300 310 315 510 | eBay
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ihens5 USB Port 3.5mm AUX Switch Cable Socket for Volkswagen RNS315 RCD510 RCD310 RCD300 - AliExpress
AUX IN Adapter Cable Built-in Female for RCD 200 210 300 310 500 510 RNS MFD 2 4054669689423 | eBay