Are they they same wheel specs?

If not, what are the specs for each (or at least for a clk63 cab) so I can confirm when talking to a vendor about wheels?

Thanks!

They are different specs due to the wide body of the CLK BS.

BS wheel specs are -

Front - 19X9 offset 25mm
Rear - 19X9.5 offset 31mm

Sorry I have no idea what the CLK63 Cab specs are.

^ I expected as much for that exact reason.

When I go to carid.com and they claim to have hundreds of wheels for my clk63 but don't differentiate between cab and bs. That does not inspire confidence.

Maybe look into the rear axle. Could it be that the wheels are the same that the axle length is different? If they are the same then I would guess the wheels have to be different. just a thought.