Search in the alfa uk website.. There are lots of accessories for the Stelvio including mud flaps... They just aren't available yet from mopar in the USA...I called Mopar USA and they are sending me rubber floor mats for the Stelvio... But I could not search them on their website yet... Might be worth a call.
Went up on the UK Mopar web site as suggested in prior thread (https://www.alfaromeo.co.uk/mopar/accessories) and found the Splash Guards under the "Safety" category but can't find a way to purchase them off the web site. Unless its because I'm out of country and prices are listed in pounds, I'm not sure, but I don't see a way to purchase the splash guards from that site.
2018 Stelvio TI Sport AWD Package 22S,, Driver Assistance Package, Dynamic Plus Package, HK Premium radio, 8.8" Bluetooth 3D Nav., Convenience Package, 19" dark hole aluminum wheels, - Vulcano Black Metallic/Red Interior -MFR Date: 6/2017.