The manufacturer made several extra sets, front and
rear,  of syncro springs in filling the group purchase
order.  I bought the extras and thus have some
available.  They will raise ride height to about
19"-19.25", and are slightly stiffer than stock.  they
are made by a top manufacturer and are of very high
quality.

I also have extra front springs.  These can be used
with the stock rear springs since they are very close
to stock in stiffness, and it is the front that are too
soft, if you use a hard plastic spacer 1/2-3/4" thick
to raise the ride height in the rear (the ratio is
1:1.6...meaning a spacer 1" thick will raise the rear
1.6").

p-mail me if interested.
steve