Well, even if it is not Full Screen, nor open Matted, but still some kind of fitting, because it shows areas not seen on other releases:

The polish Hellraiser DVD has some very strange and different framing compared to other Releases.

If I am not wrong that also is the case with the polish release of Hellbound: Hellraiser II, but there is no comparison for that.

Edit:

The US and Canadian Special Unrated Versions for "The Boondock Saints" featured Full Screen Versions of the Movie. I think they were open matte.