I've performed the last 4 oil changes on my Venue for the same reason really, wanting the oil changed at 600 miles and then every 3k. 26350-2M000 should be available at oreilly it is near me. I pay less at the Hyundai dealership so. Can you send over a photo of what you're meaning the plastic thing. Only thing I can really think of is the piece that sticks through the housing to lock the filter into place it also has a plastic push/lock pin.