I found this lengthy but interesting discussion just now while looking for information on the cuffs fitted to P-51 Mustang props. It describes the history behind the P-51B flown by Bill Overstreet in WW2; he's the pilot who flew under the Eiffel Tower while chasing a Bf-109! Very interesting tidbits about Mustangs and the differences between the variants. You should also do an internet search to see photos of this very nice restoration and tribute to a great pilot!
https://www.angleofattack.com/aviatorcast-p51s-in-review-at-oshkosh/