putting together an 81 1340 with KB pistons. Pistons came in with no paper work, have been told there is no set front and rear, so it does not matter which piston is installed in which position. I know the pistons are not marked on them front or rear, but this does contridict what the manual says. I want to be sure and since KB is closed for the weekend I figuredI would ask here. Any info would be appreciated.