Now as a twist of irony, since it is a matter of historical record that Ford named the T-5 after the aircraft, that whoever still holds the legal rights to the P-51, went after Ford for using the P-51's name without consent or royalties?
I'm not a hunderd percent certain that this still stands, but David Lindsay of Cavalier sold his Enforcer COIN idea to Piper because his firm didn't have the scale of manufacture that Piper did. When Cavalier closed down in 1971, Lindsay worked for Piper on the Enforcer, or the PA-48 as it became under the Piper designation, so is it Piper that currently holds the rights to the P-51?