On my 2002 SV I gave the following info. All measured with dampers on car
Fronts:-
384mm fully extended
363mm with car on ground but no occupants (currently 250lb springs).
Bushes 32mm long both ends with sleeves to suit 5/16" bolts.
Rears:-
480mm long fully extended.
465mm long with car on ground but no occupants (CC progressive springs).
Sleeves in bushes 35mm long to suit 1/2" dia bolts.
Road use only. Often 2 up (100kg plus 70kg) plus tools and luggage in the boot. But can be driver only.
Set it up before with our weights on seats ... front height to suit required sump clearance. Then rear of chassis +15mm.
I couldn't justify spending thousands on other brands for my road touring use. They just do the job well and are great value for money. Speak to Matt at ProComp Motorsport and ask what model of one way adjustable dampers needed from Protech
On my SV, I replaced all 4 dampers and springs for less than £600 .... supplied by ProComp Motorsport, using dampers from Protech which were revalved by ProComp to suit the Caterham. Work really well for my road use.