If Suspension is altered from stock ride height, additional measurements are required
Measure your existing shock absorber by either removing it from the vehicle or on the vehicle. Determine extension length by jacking the car up until the wheels start to lift off the ground. This will be your extension length; measure the shock from each mounting surface. Next, determine the ride height measurement of your current shock absorber. This can be achieved by measuring the same points but with the car sitting at ride height. Example A shows where to measure a bearing mount (center to center eye). Example B shows where to measure a stud mounted shock (center of lower eye to the bottom of the stud bushing). Use the dimension chart above to match up measurements.
TWIN-TUBE VS MONO-TUBE
The mono-tube design is the choice of nearly all high end and OEM and extreme performance shock manufacturers. Its main advantage is that a larger piston and a more efficient oil flow path leads to cooler operating temps and more consistent performance in extreme environments.