...did any other p***. side ramhorns have bosses to mount an accessory that could be used to mount an alternator?
You would have to modify your left generator bracket to work on the left. Why do it need to be ona the right?
EBAY has lots of them, aftermarket made by Dorman for between $59-$99. You can probably get one from a local auto parts that carries Dorman products.
Yup you can get brand new ones. I got them from summit racing. I bought both manifolds with generator mounts for $100 total.