How rare are Implant Circuitry Mk. III components?

//ads -- adsterra.com -- native banner
?>
I've just reached Gateway Bravo in The Surge 2, so I'm a decent ways into the game. Most of my gear is now at Mk. V or better, except for my implants. Those are still on Mk. II, since I have only found a single Mk. III Implant Circuity component thus far. Is this intended, and I'll be finding more later? It's a tad frustrating to only be able to stack 3 healing injections this far into the game.
Pictures about "How rare are Implant Circuitry Mk. III components?"



Circuit diagram - Simple circuits | Electricity and Circuits | Don't Memorise
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Pixabay, Jeremy Waterhouse, Dziana Hasanbekava, Ludvig Hedenborg