I've got a Dearborn 12-40 2 row planter. It's the predecessor to the Ford 309 planter. The plates are pretty much interchangeable. When I bought mine ($75), it only had 2 metal seed plates. The spaces were way too big for corn or sunflower seeds. I filled them in with some epoxy putty (the 2 part clay, not the liquid), then sanded out new smaller openings with a Dremel tool. I check eBay from time to time and add to my collection of plates. I've got about a dozen now.