
It looks like a quality product and I measured it with calipers: internal diameter 66.5mm flat to flat. If you need a 66.5mm oil filter head, this one will fit. However, Subaru oil filters come in different sizes for the same applications. I believe this will match the "black" filter set, but I haven't tested this. I have a "blue" filter 12508AA12A which is a new part number for 2.5 liter applications and does not fit. I looked into this and the Subaru service manual says to use 65/67mm 14 grooves for the blue filter.

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