When I have mine on the lake I have to get it inspected for NZ mudsnails and other invasives before launching. The tag goes on the back of the plastic seat. That's the only place it will stick and be visible to lake patrol. Ask if you can put the numbers there. If not then take the bladder out of the cover and take the cover to an upholstery shop and have a clear plastic pocket sewed on over the numbers. Or do what Jack did. Jim