Hi Stephen,
As you can see from the photo's the pulley is grooved to match the belt. The mounting bracket was fabricated from a piece of steel plate, the two lower mounts are bolts that protrude from the water pump housing and the large bolt goes back into a thread that was in the head. I think the pulley came from a Jeep, I had a piece of bar machined to fit the pulley bearing and tapped for the bolt that retains the pulley. It's simple, but does the job of maintaining contact area on the water pump pulley.
Cheers
Ross
