Will these wheel offsets fit?

[G.T]

i've come across Numerous threads on the subject, and the answers are almost always different..

What offset range is generally acceptable for 2005+ wheel fitment?
or more to the point, Would these offset wheels fit right on a 2011 GT:
20x8.5" with +35
20x10" with +35

and what about the following for a 2005, which of the offsets would work best?
19x8.5" with either +20 or +35 (which one works better?)
19x9.5" with either +25 or +45

 

[Lone Star]

I think the offsets on my 20x8.5 is 35mm and my 20x10 is 45mm not 100% on that though

 

[G.T]

i think i just answered my own question here

i came across a really nice calculator here http://marksink.com/tire_wheel_offset/offset.html that allows you to compare sizes

starting with the measurements of the 07-09 Shelby GT500 wheel (9.5" wide with +45mm offset) i found out the following:

19x8.5" with +35mm offset will fit, and tuck further inside the wheel well by 3mm which is fine
19x9.5 with +45mm offset will fit exactly the way the shelby wheel fits
20x8.5 with +35mm offset will fit like the 19x8.5" above, 3mm further inside the wheel well
what wont work is 20x10 with +35mm offset where the wheel will stick out by 16mm (5/8")