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the final instar of Chrysops relictus for instance is only about 1.5 cm long and if I remember correctly they moult about 10-11 times before changing into a pupa. A larvae of 4 mm fits rather well with a younger instar of a Tabanidae. The organ of Graber or Graber's organ is typical for Tabanidae and probably has the same function as our inner ear. If you need more literature, I recently made PDF's of all my literature on Tabanid larvae, including our Dutch guide for the adult and larval stages of Tabanidae (together with Theo Zeegers in 2000).
Look for Marchand, notes on the early stages of Chrysops : https://archive.o...r-25003764 or the early stages of Tabanid also by Marchand https://archive.o...ftab00marc and you'll find lots of info.

and: welcome on the forum