Hardtail to Softail Conversion
I am going to give
this a try.  I bought
an old hardtail
frame and the
softail on Ebay.  
They are pictured
below.
I have looked all
over and cannot
find anyone that
manufactures the
conversion kit.  I
think there is a
hugh opportunity
for someone to
make a lot of
money if they were
to design and
manufacture a
universal kit.