I am pretty sure that any one of those combos will work.But something will probably be drilled and you might need diff. cambers and steering turnbuckles.

i put FLM castor w/RPM carrier and stock arms.I had to drill the hole for the pin that holds the castor to the arm and drill the RPM carrier for the for the FLM pin also.I also had to get longer cambers and steering turnbuckles.I definately should have went with another brand castor for this setup.FLM says it fit the EPede,But not without a few mods.