the 98-01 explorer and mountaineer 5.0 had a different oil filter mount that deletes the 96-97.5 oil cooler (thank goodness!)
The oil cooler is a good place to mix water and oil when they get older and fail.
I stopped using them years ago
You will need the 98-01 style filter mount and mounting bolt to engine
You will need 98-01 lower radiator hose
You can access the oil filter bolt in the truck although it is a pita there is space to work from underneath and from the drivers wheel well
The 98-01 mount uses the motorcraft 820s filter
You could also install a remote oil filter kit and put the filter even further out, allowing you to run the beloved Motorcraft Fl1a filter and add ports for oil pressure, tempt etc. I like to mount the oil filter in the path of the cooling fan airflow whenever possible. Canton racing makes a nice billet oil filter puck that can rotate 360 degrees so you can point the hoses where you want them. I have this kit on my BII and love it. With high quality oil hoses and fittings the oil filter is mounted in front of the drivers tire
We might be able to find these parts on ebay, local u pull it yard, local private party, etc