Can you use brake hose for the EA-82s on the EA-81s? if not what's different? and when you convert over to to rear disks you just use the EA-82 hose right?

the ends will fit the same, so lengt will be for whatever you are using, but one end will fit to the others the same, same threads and all

 

on the trailing arms, you can use the rubber hose from the rear disc and connect it to the steel line on the trailing arm itself