Does anyone one know if the wheels off a Lexus SC430 fit the Z? Is the offset ok for wheel 20x9 and 20x10? Need the help.

 

no it is not
sc430 runs high offset 9 and 10's
you need low offset 9 and 10's

 

Can you explain what that exactly means? High offset meaning that the wheels will have clearance issues with the brakes ?

 

ok...
all wheels have offsets/..
a 0 means the center of the wheel is bolted on the hub.
when you go +1 through + 50 the wheel where it gets bolted to the hub gets moved to the outside of the wheel. what this in turn means is that the wheel will start moving inside because if you think about it.. you are moving the mounting point out more.
negative offsets are the exact opposite.
now a typical rwd lexus... which is most excluding the es300 and is300
can typically fit
9 +40 and 10+40
comfortably.
now..
your average z or g coupe
can fit 9 +18 10+22
give or take a few mm's of offset.
now.. if you had a g35 sedan then you would be able to run high offset lexus style wheels. because the g sedan is also high offset +40 ish area.