Austin,
That would be great, thanks! The measurement I need is the rear rotor friction surface to the back side of the hub flange. Basically, put the rotor face down, lay a straightedge across the back side, and measure down to the inner hub surface. I'll go measure mine too - I didn't write down the numbers, I just noted there was a 6.0-6.5mm difference between stock and E420.
About the 190E, I checked and I think the lower control arm is the same for the 190E "sportline" version (as my stock 300D LCA), but the standard 190E arm is a different number. Also the 190E uses a different knuckle and hub, which may move things out a few MM, and that's all it takes!
