Just curious, what brought this up? Jeff's Bronco Graveyard sells some good pads, but I'm not sure the dust element is published. Got a feeling that you will have to do a bit of manufacturer material reading and make your own selection. Talk to a couple of parts suppliers and perhaps a Dogpile search on the net may help.
I'm not sure there are any "dust free" pads on the market but there some aftermarket dust shields that mount between the wheel and hub. These might be your best option for reducing brake dust.