what did you drill out? cause like you said, the hole is tapered. if you drill it, it won't be tapered anymore. then you'd have to use a heim joint and bolt.
also, you shouldn't use an impact on those parts until it's snug. but yeah, any jobber has them. it's just a right hand threaded tie rod end.
you're lucky it wasn't the other end, as it's not replaceable. you'd have to replace the whole drag link.