Chris,
Links to photos have been posted in the past (I'll look for them). As I recall, there were different shades, which would be expected due to aging, different hues at different times/plants, and color-rendering error due to different cameras, scanners, digital-storage, and digital display.
I have seen two supposedly original "yellow" painted 261s (one still owned by Bob Adler, and one on a truck at a show).
Shades of gray/green for 235/261 engine pants (especially 1954 and later) offer as much or more confusion and variability (as you know).
I'll edit/ad links to photos of yellow 261:
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old thread - Cosmo posted links to photos, but the links no longer work
- cannot find other older links/photos - dead links
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results from a Google search
