There are 4 Aero Commander 500-U aircraft on the U.S. registry that TailWiki has a page for. Every one is built from the public FAA record — year, serial, engine, home base, and registration history — and owners and pilots add photos, trips, and stories on top. The ones listed here were built between 1966 and 1967.
N607MM
1967 Aero Commander 500-U
Leawood, KS
N757DD
1966 Aero Commander 500-U
Wilmington, DE
N67SS
Aero Commander 500-U
Cypress, TX
N999GB
Aero Commander 500-U
Twin Falls, ID