Cylinder or mains? In both cases it would be in the classifieds closest to year it would be used on. Example, mains could be T, A or Early V8. Cylinders might depend on size range. If it covers multiple years I would list in the sections if would be of use. Be sure to update the ad(s) when it sales and will need a price in the ad. Buyers can only respond with PM's, so watch for them. Suggest not posting contact info in the ad because of scammers. If someone is interested and you wish to phone or email, send that info in your reply.