Not many remember that the Mustang has a British origin.
North American P-51 Mustang
"The Mustang was conceived, designed and built by North American Aviation (NAA) in response to a specification issued directly to NAA by the British Purchasing Commission. The prototype NA-73X airframe was rolled out on 9 September 1940, 102 days after the contract was signed and, with an engine installed, first flew on 26 October.
The Mustang was originally designed to use the Allison V-1710 engine, which had limited high-altitude performance. It was first flown operationally by the Royal Air Force (RAF) as a tactical-reconnaissance aircraft and fighter-bomber (Mustang Mk I)."
Or that there was a dive bomber version called the Apache.
North American A-36 Apache
"The North American A-36 Apache (listed in some sources as "Invader", but also called Mustang) was the ground-attack/dive bomber version of the North American P-51 Mustang, from which it could be distinguished by the presence of rectangular, slatted dive brakes above and below the wings. A total of 500 A-36 dive bombers served..."
Or that there was a twin engine version.
North American F-82 Twin Mustang
"The North American F-82 Twin Mustang was the last American piston-engine fighter ordered into production by the United States Air Force. Based on the P-51 Mustang..."
Or that Piper developed a turboprop version.
Piper PA-48 Enforcer - Wikipedia, the free encyclopedia
"It was the ultimate development of the original World War II North American P-51 Mustang."
Bruce