buy a 1993 or newer rear end hub to hub, you will spend far less time and money upgrading this way (toyota invented this wheel already!) and you will get the axle shafts and full floater as well (maybe an elocker while at it?

) to nickle and dime a "kit" for the rear you are looking at $$$s (the mini truck rear disc conversion after parts will run well past the going price of a used rear full floater from a 93-97 80) plus time is money.