Here is the front, and rear view of the wheels.
Four of mine are 4 pin, and one is 6 pin.
Center hole is 2 1/2".
Not sure that this how you do it But........
I had some one tell me that if I wanted to change the placement of the pin holes,
to thread the existing hole's, and fill with a threaded aluminum rod so that it was flush.
And then re drill hole's to what I wanted.
You might check with some one who know's for sure before doing something like that !
Hope the picture is of some help ?
Cheer's, Curtis