These numbers are used to denote the firing order sequence and are positioned in the top of the distributor caps. This package is for three sticker sets of 1-12. Numbers 1-6 are used on each of the distributors and a spare in case of any mistakes. Distributor Cap Numbers.
Please note, numbers 7-12 on the sticker sheets are not normally used and only needed on RARE occasions. These are included just in case.