Did you mean a D35?
Rear Drum to Disc Brake Conversion Kit for Dana 35 by Crown
I might suggest not going through with it though. If your looking at pumping that much money into an axle, swap out the 35 and and get an 8.25, d44, or an 8.8. Otherwise, If you wheel at all, you will regret it later.
(95+ 8.8 already had disks on them

)
There are a number of different kinds of conversion and your could probably steal a disk brake setup off an 8.8 somehow and slap it on the D35.... but i wouldnt. Just swap the whole axle out.