SL/R129: Wheel size
17x8.25 ET34 245/45/17
You can go with any number close to that. If you go with stagger, the offset can be a bit more aggressive (for better look) and the rear tires can be 275/40/17
The stock 16x8s on the 400e make it look like a pontoon boat. Think 500e wheels without 500e fenders. I think 41 offset is stock on a 400e



