Horse hauler GT350,..Only one made

Im accumulating my pictures of shelbys ive taken from 1974 through present. I will indicate those that are mine,but sadly most were not. To start,I will post a one of a kind I purchased in Santa Cruz area .i used it extensively to haul horses to hunter/Jumpers though a GT500 would have handled the mountain grades better than this GT350.I was told this was a one of a kind made for a salinas rancher. is this so?