Radio install questions.

Looking at the Pioneer AVH-X5500BHS for my Golf. My question is what adaptor do I buy?

CRUX SWRVW-52 Factory Integration Adapter Connect a new car stereo and retain the factory amp and steering wheel audio controls in select 2002-up Volkswagen models

PAC RP4-VW11 Factory Integration Adapter Connect a new stereo and retain steering wheel audio controls, rear seat entertainment system, and factory amp in select 2002-up VWs •Your vehicle has no accessory power lead at the receiver. The integration adapter provides the accessory power you will need for your new receiver. This integration adapter also retains your steering wheel controls.

PAC C2R-VW2 Factory Integration Adapter Connect a new car stereo in select 2002-up Volkswagen vehicles •Your vehicle has no accessory power lead at the receiver. The integration adapter provides the accessory power you will need for your new receiver.

I don't have steering wheel controls so I'm assuming the last one is what I need?

what do you need a stereo for? you can listen to the turbo sing!