What I'm saying is that Kubrick did shoot with hard mattes for some sequences, but the film is largely 1.37:1; in fact, if I remember correctly from the last time I saw it (~8 years ago), the shot with Slim Pickens riding the bomb looks to be 1.66:1, but once Pickens enters the frame, his image actually overlaps the mattes, showing that Kubrick is, once again, trying to confuse us. The most correct presentation for this film would still be 1.37:1, as it would preserve this moment as well as allowing the other scenes to be shown correctly.