Well after reading this and other threads on the Brake Upgrade, I did it to this 90 Concours I picked up. It needed brakes anyway so why not use the money wisely and do an upgrade. I did mine a bit differently than the attached photos above. I made some brackets to go onto the stock fork mount ears, as from Kawasaki mounting from behind the ear. Then using the Tokico 4 pots, mounting them to the bracket as was intended mounting, the flats are also on the inner surface. Its just basically a Flat plate with some holes, 1 of the 2 holes are Tapped for threads, the 10mmx 1.5. The other is just drilled out to 8mm, and the bolt comes from the back through the caliper threads, with enough to get a nut on for locking, , Simple.
The center will probably get drilled or cut out later. I just needed the brakes to continue riding now, as I have just bought this bike and have been fixing all the issues.