I'm sure we can design you some that can be laser cut from say 6mm steel, then you'd need some aluminium spacers and long bolts to hold the pair of plates apart. Couple of besrings/bushes with flanges to support the shafts then all you need is someone to turn you some shafts, I'm sure you would find a roboteer happy to do that for you.
We just need to know what motors want to use then can design some gearboxes to suit.
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