Glyn M Ruck

Zero - I have far from checked everything & 204 parts have different numbers. However, Castor rods, Camber rods & their bushings are all being recommended as longer life replacements for the 203 & fit perfectly. The 204 was basically a stiffer frame with tweaked 203 underpinnings. Standard 204's without Advanced Agility Control, for example have mechanically activated variable dampers. Other than that I'll bet they fit a 203. You are going to have to do the measuring. The sway bars as you say are interchangeable. The hubs have a different clamping face offset to the 203 requiring different offset wheels - But you don't need hub components to achieve what you want. Also - later 203's even with Sportpack or US Sport versions had softer bushings fitted for comfort & better NVH - This did not help handling. Pre facelift cars handled better than post facelift. Post facelift cars feel as though they turn in better but this is not so - the "perception" is created by a more direct steering ratio & a slightly stiffer rear sway bar. Sorry I can't give you a definitive answer but I'll bet most parts can be interchanged.

https://mbworld.org/forums/attachmen...on-changes.pdf

FrankW

lowering springs have heavier spring rate which reduce the roll and help the handling somewhat. you don't need to pull the engine to do sway bar.

read up on c240wner's thread. he did the suspension mod that can be accepted by the 203 4-matic.