So the the four wheel drives with oil cooler take the shorter, smaller diameter filter, I use wix 51036.
There is also a cooler / filter adapter horizontal ( sideways) that uses a regular small block fullsize filter. Like PF 25.
In large truck applications the oil cooler/ filter adapter is vertical, normal position, takes full size filter. PF 25, 35, 45. Same diameter just big and bigger.
When I worked at parts store high school , rural agriculture city. Trucks and farm equipment wanted the PF-45 Chevy small block but more filter, that's a long time ago.
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