Umm, 40mm on your 2008 ford mustang.
#1
17x7 205/40 et I believe is 40 what size spaces to run flush?
#2
Umm, 40mm on your 2008 ford mustang.
#4
You should measure yourself, mainly because your idea of flush is going to be different than my idea, which is going to be different than someone elses idea.
http://forums.vwvortex.com/showthread.php?1879943
That being said, you're going to want something close to 35f, 40r. Seriously.