1970 gmc dana 60 rear disc conversion

[drbyrdman]

i thought i had everything to do a Dana 60 rear disc conversion. but it looks like i screwed up. i got a 3/4 ton front and pulled the discs and rotors to do a swap. the Dana 60 is totally different need what i read on line. the drums are held in place with two screws and the drums slide right off. any one know what disc i need to get. didn't see any that just slip right back on and use two screws to be held in place anywhere.