Hi all, i went down to supercheap and the ryco booklet said my 89 diesel mav needs z170 oil filter, yet a 89 diesel gq takes z115's. z170 was $25 each vs z115 $13 each, I thought they are the same block, what the? Please help

The previous owner has two Donaldson p557780 on it

Also the z115 are like 1 1/2 times the size of the z170's