I have done the big brake upgrade and have some calipers for free, just pay shipping. Pads are still in the calipers if you want them.
These calipers are rebuilt installed in 2016 with less than 1200 miles on them and are rust free.
Like I said free, just pay shipping or you can pick up if you are in Southeast Michigan. I am about 1/2 hour southwest of Ann Arbor.