CH has there's for $89.95 for a single with plug wire and boot,This is fixed timing.This Cassetti unit works with CH, Modelelectric, and motorcycle spark coils.Plus it has a Programmable Interface Controller.It has a auto advance EIS timing.The EIS Timing Curve can be changed for a specific engine.Need I say more.It has more for the money,for use penny pinchers,All of this with out PIC from CH...Part #27 above with built in Syncro Spark ....................... $144.95LOL.