Unfortunately, most vendors show the Kenwood KMR-555U as not available or discontinued.
Try the Kenwood KMR-D558BT, about $150 US ( before shipping to Oz ) and is silver and has BlueTooth.

You will need a conversion harness for this, however, and also an antenna adapter.
( The Volkswagen harness and antenna adapter usually work )
with a 2.5 volt pre-amp out, you'll have to wire the speaker wires to drive the amp, don't use the pre-amp out plugs.