<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Jeff H</div><div class="ubbcode-body">I'd love to find a set of the double adjustable Koni's for my JL8 car. If you do decide to sell those Koni's post it up! </div></div>
The Pontiac Firebird Koni shock option in 1969 was a single adjustable shock, double adjustable shocks were not widely available until the 80's and 90's ... thank us autocrossers for getting them available for the mainstream public ... but they are really a tuning nightmare for all but the most dedicated racer / autoxer and rarely used for street cars.
the "standard" Koni shock is a single adjustable shock. The adjustment is for rebound. The double adjustable shock (or strut) will allow you to adjust both compression and rebound independently from each other and, again, are normally not used on street cars.
Koni info:
http://www.koniracing.com/rrproduct.cfm