I have looked all over for the right answer I want the boss 338 wheels with the gray center for my coronet 18x8 front and 18x9.5 rear but apparently the 18x9.5 in the 4.5" bplt pattern is on back order, the wheel supplier told me I can run 115x5 without any issues and would feel alot better about it if someone else has done it without issues.

 

I would be concerned about the center hole. Maybe this might help.
http://adaptitusa.com/referencebook.htm

 

A straight mathamatical conversion shows 115mm = 4.53", which is .030" wrong. I would consider 30 thousands a LOT

 

I appreciate the help, I ended up getting them in the 114.3 or 4.5x5 I called all over trying to get them and no one had the correct bolt pattern, all the suppliers insisted that 115x5 was close enough that I wouldnt know the difference, however close enough isnt good enough for brand new quarters and my wife and kids lives. Good news is jdwheels called me back saying they found a pair for me! Got the fronts today and the rears will be here Friday! Boss 338 gray center 18x8 245/45/18 18x9.5 295/45/18 hopefully they fit in the wheel wells(now I just have to explain to my wife where the $700 is that is missing from our account hehe)