There are other options, but Ron's makes pumps and bracket kits and sells individual parts.
If you have to have the pump mounted to the engine plate, that makes it easier. Just get the Ron's kit (maybe minus the one "bracket") and drill and tap your own "bracket", really a plate, and adjust the stand-off (spacers) for your needs.
I run a Ron's flying toilet and their pump and mounting kit. It uses two holes on the timing cover to mount the pump.
http://www.ronsfuel.com If you need more pics, let me know. I have the engine out for the winter and can mock up any view you need on the engine stand and take a picture.