can use all normak bits but you WILL need the magnex relocation bracket that comes with them, do you have this, im guessing not as you get all the clamps in the kit too, i just sold a kit for 40 quid as i didnt need mine, i had my box custom fitted and they removed the hangers and relocated them that way, if you dont have the correct magnex kit as iv mentioned here you will have to do what iv done, somewhere like a powerflow dealer will sort it for you