A dealer could order the parts and install it for you, but you could probably remove the old one and install the new one yourself. It looks like one end of the rod is just a cap nut; pull that off and the rod comes out from the other side.
Part number for the
rear shield is
76118-VG3-020 ($5.02)
Part number for the
cap nut is
90301-VG3-010 ($0.72)
You can order both from any Honda dealer; here's link to find one near you:
Find a Honda Dealer