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I tried to find the dongle for carista last year but couldn't find it for sale in Canada, ecstuning.com has them but for BMW and Volkswagen only.
Any dongle like the one I posted should work. The one Carista sells is compatible with the Torque app so I would think any similar Bluetooth dongle should work with Carista.
I'll have to look into that Carista app as it can access ABS and other systems that mine can't.