They go straight on to the Frame, but you will have Trim down the Fork Stop Block on the Front of the Neck. You should also change up to a Wide Glide Front Wheel, you can use the Narrow Glide one ,but it's bit of mucking around with Spacers.

Take it to a bloke I know not far from you....Bikersdownunder......Heard he is the man for the job

could try paughco from the states they make em for 2004 and later sporties expensive but good,a direct bolt on unit can be ordered with or without intergrated shock absorber base price for chrome front end is $1870.95 us look up paughco.com