You can find part numbers for your car and illustrated details of how assemblies go together.
Look for the First 6 digits of the Chassis Number which are HIGHLIGHTED after the car description.
This Link will take you to the appropriate page to look up Parts Diagrams and Part Numbers
  SLK/SLC 180	Standard, North America, Japan	SLK ROADSTER	Car 	172.431	 M - Engine: 274.910 M274 E16 
  SLK/SLC 200	Standard, North America, Japan	SLK ROADSTER	Car 	172.434	 M - Engine: 274.920 M274 E20 
 SLK 200	Standard, North America, Japan	SLK ROADSTER	Car 	172.448	 M - Engine: 271.861 M271 DE18
  SLK 250	Standard, North America, Japan	SLK ROADSTER	Car 	172.447	 M - Engine: 271.861 M271 DE18
  SLK/SLC 250 D	Standard, North America, Japan	SLK ROADSTER	Car 	172.404	 M - Engine: 651.980 M651 D22 G 	
  SLK/SLC 300	Standard, North America, Japan	SLK ROADSTER	Car 	172.438	 M - Engine: 274.920 M274 E20 
 SLK 350	Standard, North America, Japan	SLK ROADSTER	Car 	172.457	 M - Engine: 276.956 M276 DE35 
 SLK 55 AMG	Standard, North America, Japan	SLK ROADSTER	Car 	172.475	 M - Engine: 152.980 M152 DE 55 	
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