tazz,
I made the template over a year ago, so no, I no longer have it. Making the template is the easy part, though.
Just lay the wheel on a piece of cardboard, and trace out the needed piece. You will have to "flatten out" the center section with a rubber mallet; it has a "dish" to it. My was already flat, since it had been been bent back and forth a couple of times! You can then cut out the piece on a bandsaw, or even a jigsaw with the proper blade would work. I used a piece of 6061 .1875 thick aluminum as the backing plate. Keep in mind you have to drill and clearence the hole for the mounting bolt for the adapter. When you get your wheel, you will see what I mean. Then just clamp the two pieces together, and drill/tap the holes for the bolts that hold the two pieces together.
Sounds like a lot of work, but it is not too bad. Let me know if you have any other questions! C-Ya!!
Mike