I just don't get it. The great "RC10" and the 40th Anniversary edition opened my eyes to the mess Team Associated has created. Download the
manual and check out the part numbers for your rear hub carrier replacements.

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Thanks for making me help try and find parts for you. It was an eye opening three minute journey. It will be hard for me to admit I was once an Associated fanboy from now on.
Parts & Accessories... RC10 Steering Blocks, Rear Hubs, Shock Parts
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I hope you can find a set of rear hubs separately at a non-vintage-hard-to-find price.