This is a new crankshaft flywheel rotor woodruff key to fit all the above models, (item 20 in the diagram)

If  in doubt regarding fitment , please ask

RD250 73-77

RD350 73-75

RD400 76-77

TZ250 A-F

TZ350 A-F

all   DS7  YDS7   R5  YR5