I couldn't find it by searching "Revell" & "Mustang", but it showed up as part of the kit family when I opened the details page for the 2006-vintage P-51B
http://www.largescaleplanes.com/kitdb/details.php?kit=2322
Ah, I see why I couldn't find it. The creator of the entry didn't include the plane name. I'm sure I no longer have rights to edit the dB, so if one of the mods could handle that...