Find out what the backspacing is. They look like they will fit, but be sure. 4.25" to 4.5" backspacing will be ideal. Upon further review, the 15" look they may be wide. Ask for width size as well. If unknown, ask for the tire size.
I didn't say that. I said they may be too wide. You need to contact the seller and get the dimensions of the wheels. Pictures and rim height is not enough info.
Do a search for tire size or wheel size. I think you would be safe with a 8" wide wheel on the back. A lot of people on here are running tires that are 10" wide on the back. That may be the max without making modifications. Just do the searches and read what everybody else is running.