W221 (s550) new wheels - offset options advice needed

[scb71]

I have the standard 18" wheels on my S550 and am thinking of changing. I am looking at AMG's as well as knockoffs and have some questions regarding what options I have.
My current tires are Michelin 245/45/18 and they are brand new so I would consider another 18" wheel but only to reuse my tires for now and also replacement tires would likely be less in the future.
I would also consider 19" wheels - likely not staggered to allow for more flexibility of tire rotation - unfortunately this would mean new tires now as well but it's not out of the question.

Question regarding offsets - how much play do I have?
I believe the stock is 43.
Do I have to do 43 or do I have some optionality here without spacers and without running into any issues?
Lots of the aftermarket wheels are in other offsets such as 35. I have also seen 42 and 44.

Thanks in advance for your help!

[scb71]

Here is another specific wheel question- would these from an 09 E63 fit the S550?

Front alloy wheels: 18x8.5" ET38

Rear alloy wheels: 18x9" ET39

[scb71]

Someone has to have insight here. Any ideas?

[jks2007red230]

Generally if the offsets are very close (e.g. the 42 or 44) you would be fine without running any spacers. Where you start to get larger than 5 or more mm's then you might need to look at spacers.

The 09 E63 wheels should fit.