Long Rear Shock Part Number Needed

Part numbers are different for every manufacturer. Are you looking for a stock Mopar # ?
Otherwise you need to remove the shocks and jack up the car from the chassis and let the axle hang free. Measure.
Next. With the car on the ground, either load the trunk or get some big friends to push down on the rear bumper until the car sits on the bottoming stoppers. Measure again.
Now you have the exact numbers. Now you can check with the different shock companies of your choice and check their shock catalogs for extended and collapsed applications or call their tech depts.