While searching in the old archives(what a great resource!), I came across this:
QPD, who makes the belt drive conversions, also has
custom springer front ends listed. Hmmm, I wonder if they could adapt one?
Here's Bob Scogins reply in that same thread:
"The springer looks great for sure, but make sure the fabricator/ supplier has properly fitted and tested it on a BA. I tried fitting a Paughco Harley stock style springer to my 2002 BA and there were several issues that made it impractical. Tank clearance is an issue. The springer has no offset in the triple trees as it gets it’s trail from the axle being mounted forward in the rockers. This puts the legs extremely close to the tank and can reduce the fork turning angle considerably. If not done by the fabricator, you’ll need to work out fork stops and adapt the front wheel, speedo drive, and brakes. I’m not trying to disuade anyone from going the springer route. Just make sure what you get is a turn key / bolt on installation and not just an adaptation of neck bearings on a "universal" springer to get it to fit the BA frame."
FWIW, also came across a post by Bob saying it was a Sportster front end that he put on his salvaged America.