RideTech Coil Over Questions

[GeoffP]

I've been looking at ridetech's site the last couple of days and can't seem to figure out what the difference is between the two lower end shock options for the 67-69 Camaro "Air" bar setup. I am guessing it's the difference in adjustability but can't seem to find the specifics on the site. Can anyone point me to the differences that makes up for the price difference? I'm pretty sure I know what the difference is in the two higher end parts, one is electronically adjustable and the other is the remote reservoir coil over that's triple adjustable. My guess is that the base shock is non-adjustable and the next up is either single or double adjustable. Is this correct? Maybe I'm just overlooking the obvious. Regardless I appreciate the help in advance.

Thanks!