I guess I should have included on my first post don't try to do it yourself, unless your a competent machinest(SP?)
I know several excellent parts fabricators with very good (expensive 5 axis CNC machines) equipment and skill that could make that part but I wouldn't do that as it would probably be cheaper and safer to buy a brand new excellent crankshaft instead of trying pay for and help engineer a one time set of adapter bearing spacers to save money
I know my limits and skills, I have learned to not try to do things I'm not good at in many things, especially when flying as pilot in command and racing any cars I'm driving