NAPA didn't have the O rings. Dealer had O rings as individual parts ($10.26).
Don't waste your time with any other O ring sets or parts numbers.
My ZJ is very early. Bought it new in May 1992, 30 days after the vehicle got to the dealership.
So, if your ZJ is among the very first manufactured, then, read on for the O ring solution.
Here's the answer: link and transcription.
Oil Filter Adapter O Rings for very, very early 1993 (purchased May 1992) Grand Cherokee ZJ with 5/8 inch bolt on adapter:
Note! There are a couple of different o-ring styles. HO engines have an o-ring 'kit' available w/ all three o-rings packaged together so in this regard... you're in luck! Just go to the dealer and ask for the "kit" with the o-rings together and you'll be ready to go. Getting the o-rings isn't much easier than that! The hard part will come when you start cussing that TORX bolt holding the filter mount on. Early / RENIX engines require that you buy all three o-rings seperately as they do NOT interchange with the HO o-rings. This is due to the different center bolt (TORX vs. hex head) that retains the filter mount. No big deal - they're a stock item for the dealer. These o-rings may be available at your local auto-parts store as well - they aren't anything special but you must have the correct sizes to prevent more leakage! Here are the dealer part numbers and sizes for the RENIX o-rings:
33002970 o-ring .799x.103
33002971 o-ring 1.296x.13
33002972 o-ring oil filter AD