I found this section in the workshop manual, showing different running gear for suspension.I looked at the VAG parts catalog again and almost all suspension parts look dependent on the engine type & chassis type, alternatives for the latter being standard & sports variants. The only exception I could see is the coil springs, they are numbered as Lxx where xx going from 1 to 30+. I didn't notice that before. There's no more description but that's where the terrain-dependent differences should be, I guess. I stand corrected, thanks for the information.