This might not be what you want to do, but why don't you buy a "COMPLETE" set,(including bushings and all hardware), carefully open the package, measure everything and then offer the new opened set for sale and sell them to a buddy or somebody else that wants a full poly set. That way you will know the dimensions for sure.
Just tell the guy up front thats buying them what you did so that he won't think he's getting had!!
I don't have a prob. doing this as long as everybody knows the PLAN!!
You get what you want and somebody will get what they want and maybe you might give them a little off to sweeten the deal. pdq67