As I understand the VIN codes, the WDB is a Euro spec while the WDC is US. Can anyone tell me what the main differences were between the two in a '76 450SL?

Thanks for your knowledge.

 

This is not correct from what Info I know. My very US spec 560 is WDBBA48, the 48 indicating a 107.048 or 560SL.

In a 76 450SL US Spec:

Fed bumpers
Dual round headlights per side
turn signals underneath the front bumper
Delete vacuum adjust headlights
Delete rear fog light
Emission Controls ie cat converter (I think) and egr (California)
Side impact beams in the door (I think... don't know when required)
Temp Gauges in Farenheit (I think)
probably some others...