The hyper 7 should of came with a plasice peice to hold a flat style receiver pack, I used to use eletrical tape in two spots to secrure the pack, some people used zip tires, but that will eventually tear the shrink wrap. I know the car also comes with a square plastic battery hold down, but im not sure if that will fit a hump, I thought it was just for the 4 AA RTR setup.