S, T - Single or Twin tube design
36,39,44,46 or 50 mm - Piston diameter
E - Emulsion type
D - Monotube high pressure gas type with internal reservoir in main body
P - Montotube high pressure gas type with external piggy back reservoir
H - Monotube high pressure gas type, hose mounted external reservoir
K - Emulsion type for cruiser bikes
Q1 - Progressive damping with two pistons
W - Delivered without spring
Adjustment features
C1 - Adjustable compression damping. Adjuster on reservoir
C2 - Adjustable high & low speed compression damping
C4 - Electronically controlled (EC) compression damping
R1 - Adjustable rebound damping. Adjuster wheel on end-eye or reservoir
R4 - Electronically controlled (EC) rebound damping adjuster
S - Hose mounted hydraulic spring preload adjuster
S1 - Electronically controlled (EC) hydraulic preload adjuster
B - Integrated hydraulic spring preload adjuster
L - Adjustable length
