You can cross these over to "auto" filters - as long as the specs are the same, they will work. I have a Fastrak SDX and run a Fram Ultra on it (that's the full synthetic filter). Before I found a great deal on a case of them, I used to run the Wix or Napa Gold filters (1394 or 51394). I also have a Deere with a Kaw engine and run the same filter, even though it's larger than what came on it. You can get them for much better prices than the OEM Kaws and I can almost guarantee they will be a better filter. BTW, they are the same filter used on some Toyotas.