Here are one of the Rare Fisher Belt drive 6" pump sheave #7909. These engine driven plow pump brackets are getting very hard to find.  Most of these are 4" this is the 6" this mounts on the front of the Fisher pump. This sheave came in 8 differant kits they are listed below with links to the installation instructions. All you are getting is the sheave in the picture. This is for the Minute mount plows was meant to be used with the pump with the built in tank A2311. but you could use this with any pump. Here is a link to the instructions