For the KTM here you are: aurora-rally.net/product/177-1184-enduroadventure-rally-kit-for-ktm-exc#/38-model_year-2017 You can see under the ''Rally kits'' specifically for your bike.
Hi and Merry Christmas! Indeed there is a back plate that you can add either a mob. phone and a GPS or two GPSs. It's the adventure back plate that goes onto the spine!