Jomesy

Hi all. Looking for help with stereo upgrade for 171 SLK 55 AMG. I know double din but keen to know what’s behind the unit as there are two potential fitting packs - see photos - where difference is what plugs into new stereo (if you look at pics it’s the unit in middle at bottom of each pic. One is big the other is two smaller connectors). Keen to get a unit that provides really good Bluetooth connection, has excellent call capability, and good sound with apple carplay. . Thanks!