Ingnitor, electronic ingnition,pointless system for IH 4 cylinder engines with IH distributors marked 353898R1. 12 volt Negative ground. This unit installs easily into original distributor eliminating the points and condensor. No more installing and adjusting points. No need to change coil. This system will eliminate all the problem associated with points. It will fit the following tractors A,B,C,CUB,Cub LOW Boy,Cub184,H,M,Supers,300,350,400,450 and many others as long as they have a IH distributor. I have many other Ingnitors available for other makes and models. Email with any questions.