Im new with questions.Where can I find a start button? Plus more

Hey I'm new here. I just picked up an 85 vf750f that was sitting for a number of years. I'm trying to resurrect it back to health and I seem to have been able to get most of it working without having to replace much (it's amazing what WD-40 can accomplish). A few things here and there, but I'm having a time sourcing a choke cable and a starter button. Does anyone have a good source for parts? Or maybe is someone parting out anything? I'm also trying to find a drain plug, does anyone know the thread sizing?:crazy:

Eric