I sold the Crossfire and realized I have 4 brand new ,in the box, Wix Oil filters ( part # 51226) which come with the 4 O-rings. Wix makes the NAPA Gold oil filters. NAPA repackages them under their label. They sell them for 12.99 each. I will sell all four for $36.00 plus shipping to where you are. I will only sell as a lot of 4. Thanks and PM me if interested.