.1 GREEN PLASTIC ON TOP (SLIGHTLY SHORTER THAN THE OTHER TWO SPARK PLUGS). GREEN PLASTIC HAS "SPLIT DORE" WRITTEN ON IT.
.2 WHITE PLASTIC ON TOP. HAS "AIR FRICTION" WRITTEN IN GREEN ON THE WHITE PLASTIC.
.3 WHITE PLASTIC ON TOP. HAS "BETHLEHEM" FIVE POINT SPARK PLUG. WRITTEN IN RED ON THE WHITE. MARKED "LICENSED UNDER PATENT OCT 18-98".
.1 GREEN FOR KEROSENE STARTING FROM TRACTORS (GREEN ONE FROM A RUMLEY TRACTOR) .2 & .3 WHITE FROM WATERLOO BOY OR HYDER TRACTORS. REFER TO FILE P19780089000GA.