What is the piece called the fits on the crank between the harmonic balancer

and the timing cover? FE360 FORD? I have a 1970 F250 and I am replacing the engine. I have a new harmonic balancer and I noticed a part that seems like a spacer that goes between the timing cover and the harmonic balancer on the old crank. I was wondering what it was called, and how do I get the thing off of the old crank so I can re-use it on the new crank. Any advice?
 
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