I have the 56001 56005 and 2 56014 chassies and they are exackly the same rt chassies dont have the side mounts for the upper hull but can easily be drilled and fitted the suspension mounts are the same the idlers are differant on the 56014 but the old hulls will except the new style no problems and replace the syspension arms and you can install the bearing style wheels direct bolt on and the motors from a 56005 56001 and 56014 are interchangeable but you will need to drill 2 new holes to install them in the RT model the shock are all the same on all models just the 56001 56005 and rt are held on by rivits and the 56014 are bolted on but the fisical shocks are exactly the same units