A rock guard specific to your Isata, no.
Maybe theres a reason what you have seen as OEM is
I recently had an Ultra-Guard 94 x 20 installed mounted on 96" angle iron, welded to the hitch. The rock guard is attached by about 20 fasteners to the angle iron. It's a universal fit, available in other depths I believe.
Less than 100 miles on using it but should work within reason to take some steam off of road debris.