https://www.gurochan.cx/req/res/7130.html

I did a long search for any hentai that could contain guro a while ago, you can find all that I've found in the thread I linked.
I think I forgot to link devilman and violence jack, but those don't contain the stuff you mentioned as far as I'm aware.
I'd suggest using saucenao to search for the gifs that you may already have, to find the anime source.