Requesting assistance with 20th FG P-51D Markings. Confusing image attached

[Mysticpuma]

Hello, I wonder if anyone can help me work out the markings of 20th Fighter Group Mustangs that I am a little confused with?

While looking for markings on the aircraft so I can create a paint-scheme for a flight simulator I was quite convinced that the markings were the Piano Stripe on the nose and then;

55th FS (Triangle on Rudder) letters example KI - C

77th FS (Circle on Rudder) letters example LC-F

79th FS (Square on Rudder) letters example MC-R

I then found the picture I have attached which confused me as it shows some aircraft with Olive Drab on the Rudder and wings, some with Black painted Elevators, others are clear, Black stripes on the horizontal stabiliser, others clear and Black Stripes on the wing, others are clear!

I can appreciate that some aircraft may be in the process of being transferred or repainted, but officially what were the rudder, horizontal stabiliser and wing markings (P-51D-5 era) for the Group and am I correct in thinking the 'Piano Striping' was White and Black or was it very dark Blue?

I am attaching the picture and would appreciate any help with official 'generic' markings.

Thanks, MP