I've never had floats on my cub but put the welded fittings on when I rebuit it. A couple of float pilots I talked with said they didn't like the bolt on fittings because they consistently loosened up.
A good tig welder can weld on Atlee's fittings with minimal fabric work. Also needed will be the water rudder retract tube and the pulley brackets, (adel clamped to the longerons, any good shop that does floats should have the experience to do the job?