123-DS-A for Citroën DS with carburettor
123-DS-A has all the benefits of the 123 ignition and has an angled distributor cap.
123-DS-A-V for Citroën DS with carburettor and vacuum advance
123-DS-A-V has the same specifications as the 123-DS-A but uses vacuum advance as well.
123-DS-R for Citroën ID, Traction Avant and HY
123-DS-R is the same unit as the 123-DS-A but with a straight cap (eg suitable for the HY van ).
123-DS-R-V for Citroën ID, Traction Avant and HY
123-DS-R-V is the same module as the 123-DS-R but uses vacuum advance as well.
123-DS-IE-R for Citroën DS 21 IE and 23 IE (injection electronique)
123-DS-IE-R has the same specifications as the 123-DS-R but no switch for multiple ignition curves - only the curve for DS engines with injection built-in.

123-TRACTION-SIX-R-V for Citroën Traction Avant 15-Six
123-SIX-R-V fits the Traction Avant with 6-cylinder 15D engine.

123-SM-R-V-IE for Citroën SM with the V6 Maserati carburettor or injection engine
Finally a solution for SM ignition problems!
Installation Manual