Noob conversion kit question

OK - I'm shopping around for Disc Brake conversion kits and I'm having a tough time finding anything for the 73-76 a-bodies (dart sport/duster). I want a kit because I want to make darn sure I have EVERYTHING and the junk yards around me don't seem to have anything for old mopars EVER.

So do they not make 73-76 a-body conversion kits or do I just suck at the interwebs? Is it because so many cars from 73-76 came with stock disc brakes? Will the <'72 kits work on a 73-76?

Please help a confused noob to pull his head from his arse and see the light.