Lowering 08 E350 4matic

The car is new to me, so I'm okay if its just user error and not being educated on my options. What should I be looking for to lower the car 1-2"?
Thanks in advance!
H&R makes a 2 spring options for the w211. Mercedes also about 3-4 different springs with different heights and they are indicated by colored dots.
Again, thanks in advance!



