Accoriding to Tire Rack part numbers, the Eilbach Springs from an '03 SLK320 are identical to those from an '04 Crossfire. The H&R springs however have two seperate part numbers. I assume that the fittment is the same and perhaps they are just different spring rates. My real question is how does the suspension layout of the SLK compare to the Crossfire. I've been told that the H&R sway bay kit from the SLK woulf fit the Crossfire as well. Does this mean that the SLK H&R Touring Cup Kit fits the Crossfire too? Any well informed input would be greatly appreciated.