What exactly are those measurements for ? If they are mounting bracket, the alternator has a "camel humps" type mount I believe on the bottom of the case. 2 projections for bolting to another bracket that bolts to the engine.
I don't believe you are trying to mount this as an inline direct coupled motor, correct ? You might try a jack shaft set up for e-assist ?
Once he gets it, we will get him on this thread. He may as well get involved also, right ?