There are 3 Stewart 51 P-51D 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 1999 and 2004.
N51XZ
2004 Millard Richard N S 51 D
Tampa, FL
N351KW
1999 Wagnon Ken J STEWART S-51D
Montgomery, AL
N338RB
Ballard Richard J STEWART 51
Palm City, FL