What's the part number on the package for your 86.5mm pistons and for your 86.5mm rings?
From '97-'01, Nissan used the same part number for the oversize (by .02") rings for the 16VE, 20VE and N1 piston. So, in theory, they should all fit. However, it is not unlike Nissan to make slight changes to a part and yet still use the same part number. For instance, Nissan now uses (from 2001+) a different part number for oversize rings for the 20VE piston vs, the 16VE N1 piston. Maybe they made a specific change to the pistons and/or rings after 2001? If this were the case and you ordered the latest N1 oversize pistons and were given the latest 20VE oversize rings.........
Latest orderable part number for 86.5mm 20VE piston ring set is: 12035-4M810
Latest orderable part number for 86.5mm N1 piston ring set is: 12035-2J210
Latest orderable part number for 86.5mm N1 piston is: A2010-1N577
The good news is that the ring set (N1 86.5mm - 12035-2J210) can be ordered at your local Nissan/Infiniti dealer. The 2001 Infiniti G20 also uses this ring set for it's oversize (by .02) 86.5mm pistons. You can also google the number and a bunch of online Nissan/Infiniti dealers show listings for the piston ring set.
All of this information is based on part numbers from the Nissan parts catalogue. I have no personal experience with o/s 20VE or N1 rings.