71 duster factory disks to bbp

ok different question....if I wanted to go for some wilwoods, what ones would I get. do I order the kit for a 71 duster with drums in the front and go from there, or do I order a kit for a 73 duster, that already has existing disks. I noticed that wilwood does not offer a kit for us guys with the KH factory 71 disks (as far as I know)