It is posible for both threads to be strip out for the plug just to free spin, if its doing that then it should be leaking? Who did your last oil change??????
As to your question im 99% sure a 2.0L 200sx and Sentra oil pan will also fit. Any new factory oil pan will come with the drain plug. Price it out at Infiniti then price it out at Nissan??????? Depends how fast you need it theres also.....................
Take a flat head screwdriver and work it between the drain plug head and the pan. If it is a small gap, use a paint scraper first. While exerting pressure (like you are trying to pry it off), start to unscrew the drain bolt. As long as you apply pressure while unscrewing it should come out.
Once out you can use an aftermarket drain plug designed for stripped holes. Some recut a larger thread, others use a bolt and rubber seal, that expands while it is tightened. Just go to your local auto parts store and take the old drain plug with you. They will know what to give you.
I was going to try and get the oil pan off a car that someone was parting out. So, then I wouldn't have to pay full price for a new part. I saw that someone on sr20 forum was parting out a 200sx and thought i could get a pan from them. The 200sx is older, but I know a lot of the nissan/infiniti cars have interchangeable parts. So i was going to see what models/years I could search for.