OK bear experts, I am curious.  I have some old cedars (yellow shafts, seem to be target), as well as some black bearglas and aluminums.  Is the most common fletch for the late 60's era into the 70's a 5" parabolic?  I guess what I'm looking for is what the most common fletch for that era would be...??  Thanks guys.

WOOOPS!  Just caught the other thread on here, boy do I feel foolish..