I have a set of Sears router cutters (probably from the '70s) with an arbor and several edge guides. The shaft of the arbor is bent and I can't find anything comparable. I've checked Sears, Rockler, Home Depot, Lowe's.
It looks like all of todays cutters are a single piece - cutter, guide and arbor.
Otherwise, I'll have to start buying new router bits each time I start a new project.