That is the holy grail you speak of. If you can get the rear 2pot, do it. I can fill you in on every thing else you need. it will not fit on your current rear backing plate
You need to get a rear backing plate that has a 4.5" mounting hole spacing. Unique to the 2pot rear caliper. The standard single pot calipers use a 5.75" mounting bolt spacing.
That kit has been cost prohibitive for most of us, but if you got the hook-up run with it.