All the ones I've seen mount the Alt on the right.
I'm pretty sure the parts mentioned so far mount the Alt on the right as well.

(but you want/need it on the left).

Problem with low mounting it on the left like many GM products do it, is the oil pump and oil filter is in the way.

I think you will end up either fabricating something to work, or converting it to LH lower hose.

You could also high mount it on the right, it's not the most elegant solution as the Alt has to stick way out,
it's a little bit ugly but it can be made to function.