take a tape measure and measure from the floor to the center of your rear leaf mounting bolts, the bolts in the way back, also measure from the floor to the bottom of the frame rails on each side from front to rear. it will help you narrow it down. get your car on a level flat surface to make sure you get good measurements. if you do not have a level floor you can use plywood to get a level spot to park the car on. start at the bottom and work up from there
Luke