All I did was put them side by side and the outside diameter seems larger to me, not by much.

And they are mounted further away from the hub, therefore I don't think they are 300E's calipers with a spacer between them.

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Peter Chu aka PIKACHU
08 C300 Premium Pkg, MM Pkg, Sport Pkg, Keyless Go
86 300E soon to be E36 with Euro Headlights
400E front & rear brake upgrade
16" CLK wheels with Michelin MXV4 plus Green X