Expensive solution???
You can make an alternator bracket out of a small piece of scrap sheet styrene, a short length of thin brass strip, heck, even a strip of thin cardboard or card stock. Paint it semi-gloss black and glue it in place.
Expensive? No, free! All it takes is a few minutes and a little ingenuity.
Whenever I see a "detailed" engine with ignition wires, battery cables, heater hoses, etc., and that "magic floating alternator" I always think... why??? Why go to such trouble to add all the details, then leave off that one obviously missing detail?