If you want that in torrent-based form, you should rely on private trackers, where both of those games are readily available.
They're a giant pain in the ass though. I was part of one years ago, daemon or something? I can't remember. I think I joined another after that. I had to go out of my way to download shit I don't like every so often so I could upload something that was in demand to keep my ratio up. Seeding obscure shit or whatever you happen to download doesn't work because nobody needs it, or if they do there's already nine million other seeds with faster upload rate than you, so you contribute fuck all. And after all that effort, it was still missing shit I was looking for, which is why I eventually forgot about it, because they had a ridiculous standard of quality for the torrents (all FLAC files and shit like that) so it'd be ages before something showed up there and even if it did I preferred something with a smaller file size.
Besides that, there's the question of even getting started. I saw one recommended while looking for torrent sites earlier and it mentioned needing to wait months to join without a recommendation. At the end of the day, when this shit is so exclusive, it's also going to have a ton of stuff falling through the gaps because it's got too small a user base.