hey guys -
my first visit to the softail forum - so if my question is stupid - please cut me a bit of slack.
i searched a bit - but we all know how that goes.

i'm thinking of fitting some deuce risers to my superglide.
seems the deuce risers have a flange on the bottom.
does this mean the top tree is special to accept the riser, or are the bushings different?

thanks.