By the way, from a scarcity point of view from manufacturing volumes I know in 1966 there was twice the demand for verts than fastbacks sold, so you would naturally think the limited number of fastbacks could make them more expensive, however if you look online for 1964-1967, Australian sites such as uniquecarsales.com.au there are about 21 fastbacks vs 19 verts, so similar sales numbers, which means as a ratio more fastbacks are up for sale against how many are on the road, probably double.
Cheers Bee