I RECENTLY FOUND A HYDRO-TRAC 12 MOWER IN MY GRANDPAS STORAGE BUILDING .. I THINK IT IS A 1969 MODEL .. I WAS TOLD IT WAS RUNNING BEFORE STORING.. THE FRONT STEERING LINKAGE IS MISSING AND THERE IS NO SPARK PLUG .. I NEED TO KNOW WHAT SPARK PLUG GOSE IN IT AND WHERE I MIGHT FIND THE STEERING LINKAGE .. THE ONLY NUMDERS I COULD READ ON THE ID TAG WERE 25500 ..