Some have
said that the "Sabre" backrest sits too high on the bike so
what I did was to re-drill the mounting holes in the backrest
bar and lower the backrest about 2". You will need a #9 drill
and a M6X1.0 tap. The existing upper mounting hole on the bar
are now the lower mounting holes. I drilled + taped two new
upper mounting holes (you can also change the angel of the
backrest if you want). I cut off the excess bar about a 1"
below the lower holes. This set up works great with the
mustang wide vintage seat. I have attached before and after pics including one with the mustang seat.
Before

After
(stock)

After
(Mustang)
