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Thank you, atylotus!

I kept arriving at tabanidae when I was first searching, but could find no documentation on any tabanidae species with larvae being anywhere near this small. After reading through the neartic manual and researching some more with better terminology, I came across the term "Tabanomorpha" which I've been using to describe them, but thought they were too small to be a species of tabanidae.

And that organ in their terminal segment has been driving me mad, and had become the focus of my hunt here lately, I could find no reference to any diptera larvae possessing any such thing. So, finally having a name for that is fantastic.