I never had it in my 74 V, and they did not even put it in when they made the boat.
But when I took a 10 foot wave over the bow it filled the inside up to the gunnles and still floated!!
By what i read in another thread not long ago, the 21 has some sealed areas for flotation so with that news, and what i saw with my old boat, and the $$ your going to spend i would say go with out!
That said the coast guard has said all boats from the late 70's have to have flotation in them.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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