Yes, the offset measurements are in +18MM and +25MM.
I am not sure how you'd fit 19x10 with 275x30 tire in the front. If the car was not lowered, than it might fit, but otherwise I don't think it would be possible with out rolling fenders, etc. or wide-body kit, as I am pretty sure that E39 M5 and E39 540 has about the same specs when it comes to offset, width, etc.
Out of curiosity, why would you want to run such wide rim & tire in the front? If you were running 19x11 or 19x12 in the rear, I can see running 19x10 in the front, but otherwise it seems like a lot of unnecessary extra weight on the steering column, etc. Plus handling might be a little weird.
Here is picture of my ride.