I'm still using the 11.75" version of this:
https://www.moparaction.com/2016/03/16/disc-main/
But with the optional slider type calipers.

it's really heavyweight, but was made to stop a heavyweight vehicle over and over.

I don't think anyone sells an actual kit with the late b body 11.75 rotor.
The kits mostly seem to default to F/M rotors which are also fine, just a little smaller.