You already have them. They are not loops per say but I can tell you after destroying a driveshaft, nothing is getting out of the tunnel with the safety plates bolted in. There are two of them, one for the front half of the driveshaft and one for the rear. Take your vehicle to a shop, put it on a hoist and take pictures. They might let them count and if they don't, explain to them that a drive shaft hoop will offer no more protection than what is already on vehicle. Or tell them you installed driveshaft hoops and when they see the little bars going across, they might not be the wiser.