If you just need front struts then that is all you need to order. It's best to have whoever is doing the work inspect the vehicle in case there are other things it needs.
Alex
RepairPal Certified shops can diagnose and repair your 2015 GMC Yukon. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
It also depends on exactly which type suspension this vehicle is equipped with. Suggest doing a little more research - Google.