So I had the same misconception and was trying to get front and rear arnott replacementd but fronts were out of stock.So it seems lately places are starting to get the GM OEM rear Z95 magnetic ride control rear shocks in stock for our rigs and the price has jumped up significantly.
ACDELCO Part # 84176675 are now $435.79/ea. on rockauto
They used to be around $383+/- per previously on rockauto.
This makes the rear ARNOTT AS3066 option now $384 cheaper when replacing both rear shocks. Which is significantly more attractive.
I've been finding mixed information on the ARNOTT AS3066 rear shocks though. Some sites state they too are filled with magnetic fluid designed to work with the OEM Z95 suspension system. Some places say the plug that plugs into the OEM shock cable connection for those with the factory Z95 magnetic ride control is to just "over ride" the factory suspension system so there are no error codes.
To my knowledge they are a delete kit with built in sensors. Just installed the rears this past weekend and have no complaints so far
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