b. Springs and Shock Absorbers
1. Shock absorbers may be replaced provided they attach
to the original mounting points. The number and type
(e.g., tube, lever, etc.) of shock absorbers shall be the
same as stock. The interchange of gas and hydraulic
shock absorbers is permitted. Remote reservoir shock
absorbers are prohibited beginning 1/1/03. As of
1/1/03, external adjustments of shock control shall be
limited to two (2). No shock absorber may be capable
of adjustment while the car is in motion.
2. MacPherson strut equipped cars may substitute struts,
and /or may use alternate inserts. Spring seat ride height
location may be altered from stock. Remote reservoir
struts and/or inserts are prohibited.
3. Springs of any origin may be used, provided they are of
the same number and type as originally fitted, i.e., coil,
leaf, torsion bar, and that they shall be installed in the
original location using the original system of attachment.
The joining of two or more coil springs by any means is
prohibited. The use of tender springs (designed to capture
the spring within the perches at full droop) are permitted
provided the tender springs are completely compressed
when the car is at static ride height. Shackles or spacers
may be used to adjust leaf spring ride height. Spacers,
including threaded units with adjustable spring seats,
may be used with coil springs. Coil over threaded body
shock/struts are permitted.

I don't see where the adjustable spring perches are a problem?

c. Suspension Control
1. Any anti-roll bar(s), traction bar(s), panhard rod or
watts linkage may be added or substituted, provided
its/their installation serves no other purpose. The
mounts for these devices may be welded or bolted to
the structure of the vehicle. No suspension control
mount or component shall be located in the trunk or
driver/passenger compartment unless installed by the
manufacturer as original equipment. Traction bars used
to control axle rotation shall be one piece solid bar or
tube. Heim rod ends may be fitted.

Looks like other than a cock-pit controlled bar everything is legal there too.