Most are 15 x 6, so if these are 15 x 7 (off a later wagon?), they increase tire choices. Not Mine. http://newhaven.craigslist.org/pts/1674231514.html
That IS a good deal if they are in excellent shape and the caps appear to be included. They were optional on 80-81 wagons I believe. I already have a set and they cost me $1000 with the caps.