I am planning on getting a urinal with a 2" NPS spud on the back for the waste line. What will I need to connect this to a 2" stub coming from the wall? Seems like this would be a tight connection to make between the urinal and wall.

There is a rubber ring available for this connection, as you bolt the urinal to the wall the rubber ring will be compressed and mae the seal that you need. This ring should be available at the place you buy the urinal

There is a 2" (cast) female collar that came with the urinal to hold the gasket and installs between it and the wall. I have a 2" sanitary tee coming out of the wall, so it sounds like I need a 2" male adapter installed between the tee and this female collar. To get the urinal flush against the wall it looks like only the male threads will be allowed to protrude from the wall. But, this is being installed against a standard 2x4 wall and the inlet to the tee is already flush with the drywall. There is an inset on the back of the urinal but not enough to cover the male adapter.