Here are the OEM numbers. Just go on the Autolumination site and match the numbers with the proper led's. They have several that will fit in many cases so it's up to you but if you are looking for the bright bluish color, always choose "Super White".
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2000 MERCEDES-BENZ CLK (With HID (high intensity discharge) headlamps)
Low beam headlamp
HID-D2R
High beam headlamp
H7
H7ST Silverstar High Performance Lighting: the whitest and brightest Halogen
H7CB Cool Blue Halogen Upgrade: White Hot; Super Cool; 100% Street Legal
H7LL Long Life Halogen: Lasts two and a half times longer
Front turn signal
1156A
1156AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
1156ALL Long Life Upgrade: Up to twice the life of the standard lamp
2827
Rear turn signal
7507A
7507AST Silverstar Signal Lighting: Complete the Look: Crisp, Clean, Style
Tail light
5007
7225
Stop light
7225
High mount stop light
%COM
Fog/Driving light
H1-55W
H1ST Silverstar High Performance Lighting: the whitest and brightest Halogen
License plate
6418
Back up light
7506
7506LL Long Life Upgrade: Up to twice the life of the standard lamp
just looking at this and my sidemarkers(in the bumper) are wedge bubles and the 5007 are not is my car messed up or am I missing something.....anyone talk it over amoungst yourselves....