Talk to Bell Tech Reps, they will be able to tell you exactly what you require or failing that try McDermott Aviation, they are the 214 Operators in Oz and should have up to date info, however, 214B mast is Hours only according to info I have, and the 214ST is RIN lifed.
Do not use this as gospel, my info is from an out of date manual and may not be accurate.
See below.
214B 214-040-090-105, -117 Main Rotor Mast Assembly 5000 hours
214ST Main Rotor Mast 214-040-090-109 140000 RIN notes 1 & 2
note 1 RIN (Retirement Index Number) is the retirement life based on fatigue damage from
normal helicopter lifts and takeoffs. New components will begin with an accumulated RIN
of zero that will be increased as lifts and takeoffs are performed. Operators must record
the number of lifts and takeoffs and increase the accumulated RIN accordingly. When the
maximum RIN or retirement flight hours is reached, whichever occurs first, the component
will be removed from service.
Note 2 Each takeoff or lift counts as 2 RIN. If logging, increase RIN count to 4.