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Information here is general but remember too for those building Australian, New Zealand, Canadian & US manufacturered vehicles.. . the THEN local content rules that in Australian and NZ.. often meant soft materials were locally sourced and could again be different to these.
BUT the main objective 50 + years later.. is ultimately to get a headliner made that should fit the Fisher Body master plan as simply as possible for each body style, and this may help with the "please explain" needs out there as to why some colours may not be 100000% exact for every application.