I need help finding the cut versions of Reanimator?

Hello, I am currently doing a project on Reanimator and need access to the different versions. I currently own the unrated version on dvd, but I wish to compare it to the R-Rated version and UK original release. I cannot find these versions anywhere online and was wondering if anyone could help me find them? Torrent sites are fine as well, as it seems that'll be the only way?