Unfortunately that is the exact shape and size of the part, only that there are two cavities in the mold. One facing up, the other upside down. Nearly in the shape of a square.

As for the runner and sprue - sprue starts at .275 and opens / tapers to the runner at .400

The runner is circular - undersized at .370 (I say undersized because typical runners are 75% of the part wall thickness - usually)