I didn't know until recently that there are two different housings and thus two different filters for the Trax and the like. One seems to have the ADBV on the filter, I think UFI. Almost found out the hard way. Why is this? Seems silly. Every time I go look up a filter I have to see "for housings marked with..." So from now on I am just sticking with A.C. Delco for my UFI housing. I understand Fram also makes a filter as well as Mann or Mahle. .. Any others? Thanks!