#251 and #252 - I think you should keep the dual color motif of the original #216. Also gold should be yellow gold, rather than metallic gold.
The specification of Pantone Colour
adopted for the colours of the ASEAN emblem are:
Blue: Pantone 286
Red: Pantone Red 032
Yellow: Pantone Process Yellow
For four-colour printing process, the specifications of colours will be:
Blue: 100C 60 M 0Y 6K (100C 60M 0Y 10K)
Red: 0C 91M 87Y 0K (0C 90M 90Y 0K)
Yellow: 0C 0M 100Y 0K
Specifications in brackets are to be used when an arbitrary measurement
of process colours is not possible.
In Pantone Process Colour Simulator, the specifications equal to:
Blue: Pantone 204-1
Red: Pantone 60-1
Yellow: Pantone 1-3
http://www.aseansec.org/7095.htm