Well it would help if we knew which JD and what motor
JD did some silly "easy change" thing a while back which I toss away and I think is what you were quoted on
As for the oil filter I fit either Stens or Rotary depending upon which was cheapest at the time from my wholesaler
Mower oil filters are dearer than car ones because there are a lot fewer made and smaller batches with less sales pushes the price up
Most US made engine will take th same oil filter so I use the B & S large & B&S small on everything with a NPT thread the decision is the available space
I do keep some thinner Kohler & Kawakasi ones for the same reason .