What other options are out there for large bolt pattern brakes that don't make the track wider?

Viper caliper swap with the drum spindles? Does the large bolt pattern rotor fit on the drum spindle?

I know a guy who put converted a duster to LBP with a kit that involved machined early mustang rotors and some caliper adapters. I can't remember all the details, but I think he was able to keep the stock spindles and track width.