Newbie here. Recently purchased a 98/R170 and want to install the Bose kit out of an upgraded slk320. I have the 4 speakers and the amp but no wiring so wondering as this was an upgrade kit, if the cables would already be in there as a part of the loom? Also looking to upgrade the head unit to a more modern mp3/bt unit. Any recomendations or idlers about the wiring before I commit on the Bose?