I have a couple of 5kw generator power heads I picked up real cheap. I'd like to run them with something other than a small engine (I haven't decided what yet.)

Does anyone sell adapters that would give me a plate, bearing, and shaft, so that I could turn these? I believe it's a female J609B on the powerhead. Of course it bolts on perfectly to an engine which has the male end of this shaft and that centers it perfectly, but I'd like to simply bolt on an adapter that I could later attach a gear or pulley to.

If nothing like this exists then I guess I can get one machined but I figured it might be an in-demand item for people building their own generators.

In the end I would probably like to hook both of these powerheads to a small diesel automotive engine, geared so it could basically idle while driving these at 3600 rpm. It should reduce the fuel costs & noise and greatly reduce the need for generator oil changes and maintenance.