Hi, the standard ES Shocks are made by KYB in Japan, the KYB part number as mentioned for standard ES (not shortened is 334390) the ones i mentioned above are KYB #334369 are the (heavy duty/firm option) same length, these KYB's are made in japan and are identical to the factory VRX Lancer (crazy cheap at moment) the VRX (factory ones are 25mm lower than your standard ES ones, they can handle (so KYB states) a drop of 30mm with eaze.
That means that the 30mm lower pedders springs/lovells won't be a problem, but king springs have a drop of 25mm to 40mm, so they may or may not sit in the spring seat without dropping when raised, any lower and you will need a shock (strut) with a shortened stroke length if you want to go to 50mm.
You may find that coilovers will be a better option if you want to lower it 40-60mm as you can customize it the height you want front and back.
I'm just removing all my coilovers at the moment and fitting the 30mm lower coils today to these new VRX struts above, and they just seat in the strut by about 5mm pre tension.