Just measured the distance from the floor of the garage to the highest point of the fender well,and this is the result: Pass.side rear: 26 1/2", Drivers side rear: 26" Pass.side front:27 1/2", Drivers side front: 27". Could this be worn shocks,springs or both?

A half inch is no biggie,

Maybe the previous owner is/was a big person? I have seen it before, three hundred pound drivers and up driving cars with distinct listing towards the driver side.

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Chas

Had a 380SL, 450SL, 380SEL, 420SEL, 500SEL

Got a Euro 500SEC right now.

Also check tire pressure. Check height from floor to top of wheel rim, on both sides. If the rim measurement described here is different, then it is the rim or tire.

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1989 420 SEL

The correct way of measuring is from the centre of the hub, to the bottom of the wheel cut-out.
It is not unusual for cars to show as much as 1/2" difference between the driver's & passenger side.

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2007 C 230 Sport.

New dimensions:From center of wheel to highest point of wheel well. Front drivers side=161/4 pass.side=165/8 Diff. of 3/8--- Rear drivers side=145/8 Pass. side=15" Diff. of 3/8". This may be normal but i would like to add 3/8 shims to the Drivers side front and rear.1.Will this present a problem? 2.How are the shims installed?

Just put a 4ft. level on garage floor, and it is level.
I just need info on how to add 3/8 shims under the front and rear springs.Do i need a spring compressor,should both shocks be removed? Any help would be greatly appreciated.