So far as I can remember, yes it's an early 2.5 so that would be a 12v. Body was average, but straight and the transaxle seemed good...
One owner, not the type to try launching it or do circle work (I've seen chunks of crown-wheel rip through the floor pan and back seat in a 75 after someone abused it for a while in a carpark...)
As far as contacting the owner, try the Taupo Gliding Club since I can't remember the guys details - it was in a shed at the Centennial Park airfield.