Try www.ereplacementparts.com. You might get lucky. Even if they knew the original manufacturer, Craftsman changed a few parts so all parts won't interchange. Good luck.
That only makes sense. All my 5 routers are old Craftsman, they all work, but if one dies, I may keep it for parts, but not about to look for any parts for them, just not worth the effort. When they all die, I toss whatever I have, and buy a new router.I'm sure the regulars get tired of me saying it, but why bother? It's an old and technically obsolete piece of equipment. Like driving on bald tires.