They probably have some kind of either a roller doing it, or spraying it on while the filter is rotating. The rubber stamp is a good idea, but I can not imagine it will be possible to get that made at a company. It would be something I would have to make myself. The problem would be that it has the name MoPar and Chrysler there. A year ago or so I wanted to get a brochure made for an old truck, and it was for myself. I went to Staples and to FedEx, and the answer was the same. If you can some with a written letter from the truck manufacturer that it is ok that we print it out like that, then we will be happy to do it.
Bill