DR. DIFF 11.25 rear Disc Brake Kit

The Explorer calipers are a 48mm piston and the Mustang Cobras are 38mm piston according to RockAuto's catalog.

On Drum in Hat vs integrated into caliper - the drum in hat system has superior hill holding torque due to the wedging action and physical size of the shoes vs the small brake pads. Other than rust, my opinion is its a less troublesome system than integrated into the calipers. It just has to be adjusted correctly so it's not dragging so much and of course all the cables to release, but you could have similar issues with the integrated calipers. The integrated calipers seize occasionally too and there is an additional hydraulic leak path. Now, with that being said I have had both types and really only had a failure of the integrated calipers, yet still chose them for my Duster.

I just worked on a Jeep Patriot last summer which is basically hashed (2013, 141k, all time spent in midwest salt-fest winters) with a drum in hat that was barely used and everything still worked fine and it came apart without needing to replace anything. Was doing wheel bearings on it. The boots were tore on the calipers and the pins were seized so it had already trashed the pads there too.