Tire size change over?

You're moving from a 215/70/15 tire to a 16-inch rim. To find an equivalent tire size, we need to maintain the same overall diameter.

Will 220/65/16 or 215 65/16 still work?

I would use a measuring tape to make sure you are not going too far off of the original tire size, but I think they should work.

I found 2 for the rear 225/70/16.since they don't turn, and the height is 70 like the original ones can i get away with those? It's a 2WD,

can I ask what "Since they don't turn" means? The new tires will not rotate? can you upload an image or short video of what you are talking about?

The front tires turn with steering, rear do not. Is there a 'black box' on my truck? I heard some have them. Can that pose a problem with speed, and where is it located? Also, the tires i found are the 235/75/16 for rear.

Yes, tires size can cause issues with the ABS if there is a big difference in size, not sure what you mean by "black box"? Can you start a new question for it and include images?