Are you asking who made one or who here has one???
I think Bud (budbuilt.com) makes a rear diff. armor piece that protects the e-locker as well but I don't believe a whole lot run them because the Toyota rear diff's are pretty darn rugged by themselves, the e-locker is up and out of the way from damage for the most part, and the armor only takes away from your precious ground clearance.
I have ran my truck pretty darned hard and many others on here have done the same and I have never heard a report of a damaged e-locker.