just checked out the wacker site and the ryobi parts are a good deal...but then some of us still like doing it the hard way

if your engine is the long shaft version then the hub is simply a spacer...a stack of washers would do just fine. mikenlapaz even made a hub from plastic[8D]

the mount is just a piece of rectangular aluminium tubing...all you really need is a drill, a hacksaw and file[8D] you can also just use long backplate bolts with drilled dowels or metal tubes as stand-offs

either way you will have fun

dave