Erp, you are correct. '79 b310, model 210. Honestly, not sure what the bracket itself looks like. I've not seen it personally and can't seem to find any pics or references to anything but the pump itself. That very well could be it?

EDIT: Here's a pic I found of the engine from my model with the pump bracket slightly visible. Unfortunately this is the best I have for identifying the part.

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  Datsun-B210-28 (1).JPG (149.58 KB)