On Sun, 17 Mar 2013 17:43:18 +0000, Ed Loomis wrote
(in article ):

Thanks again for all the great posts. I think that this one is
misidentified, however. The vertical tail plane shape and the longitudinal
ribbing of the fuselage point to an Australian Wirraway rather than a North
American Harvard which had a metal skinned airframe.

N7021 is definitely listed as a Harvard I and is a sibling of the Wirraway.
Later marks of the Harvard (and the T-6) are more like cousins (relatively
speaking).