for Citroen DS, Traction Avant and H-van
|the 123\DS-R has a straight up cap. It is essentially the same unit as the 123\DS-A : it contains the same set of 16 advance-curves.
Two curves are dedicated to the Traction-Avant engines, the 'Perfo' and the '11D'.
For the 'H'-van there are two advance-curves too, both for the 'H78'-engine. One of these has a so-called 'rev-limiter', to prevent unwanted engine-damage.
Might you require vacuum-advance : specify a '123\DS-R-V'.