The thing is, that one is designed to bolt onto a 'Monark' type springer rocker. Venice Motor Bikes makes one that works with a 'Schwinn' type springer (they're also forum members). Maybe it can also run on a 'standard' (albeit bent) fork.
They're solid dudes, try reaching out to them they may have some advice for you.
Good luck dude.
Cheers,
Dr. T