Buy as pair and save. Correct AC blue filter with red lettering, 3/8" in and out.. Bracket mounts on timing chain cover, zinc plated. Cars equipted with factory air had a return line, off the filter. I carry both AC filters...with or without return line. You will be able to indicate which you need as you place item in cart. Buy both and save. There is a cost difference additional $13.00 with the return line.