we've got a '72 Mark IV we use for towing purposes, but need to find a way to stablize the rear suspension better. isn't the rear suspension the same as the big Fords and Mercs from the mid-sixties to late seventies? if so, we're hoping to get the swaybar and springs out of a police package Ford or Merc to tie down the rear of the car. sound right? also, is anyone aware of somebody offering aftermarket suspension upgrades for this car? thanks.