Hey redstar2, I have a plate i made to hold my key switch on the left side. That's where i re-located an ignition switch.
You can weld or have someone weld a bracket to the top motor mount that you can tap for screws or just have bolts that go through and put locking nuts on the back side for the stacks to bolt up on the left side. I cut my motor mount down so my key mount would not stick out so much. It's just a matter of making something that you can mount it to.