Is there a 5-3 GB version of 2.7 in x264 MKV format?
5-3 GB would be 2 GB, if my math is not mistaken… Best to just ask for what you specifically want, rather than to leave it up to us to figure it out (there’s always the chance we could get it wrong).
More seriously, anything in the size range you’re looking for, which isn’t also a lower resolution / different format (e.g. DVD), that you’d find to download somewhere would be a version that’s recompressed by someone unrelated to the project. At that point, you’re often just as well or better off taking the full quality MKV and, as mentioned by others, compressing it yourself (for just your own use) through a free program like Handbrake (and it works in Linux, so even I approve!). At least that way you’re not propagating others’ terrible encodes, you know exactly what you’re getting, and any problems you might find you can easily figure out whether it is something you introduced by comparing it to the original you compressed yours from before complaining in here (fielding complaints about crappy reencodes people confuse for the actual releases happens so very often). Just don’t go around sharing your own reencode with people (unless you’re a video compression expert, and frankly, very, very few people are), as it won’t do the Despecialized Edition proper justice.