You will need the 4B0 035 192R unit, the adapter harness from Kufatec or similar, a GPS antenna and an antenna adapter. Check the cables/adapters/antennas forum, there are pictures and several refernces to people/companies who offer those adapters.
Your GPS antenna is in the back. Unless you want to route a cable from the back to the dash, it would be easier to install a new GPS behind the instrument cluster.
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