BC,
It says the front-end is from a '46 Harley. I would assume from the EL model. Its not a easy peice to get but not extremely rare. The Standard Bonny frame is a little different than ours but I don't know the exact differences between the necks. Springers can be made to fit our bikes. There are many people out there who are making them. Its gonna come down to the fact that your bike will have to be on-site in order for the builder to make one thats all.
Fryguy