Hi Dan, I looked at the photos and did some greyscale matching with my paint comparison program. Though Blauschwartz 58.2 does not have an RAL number the two that came closest to the photos were RAL9011 (98.8% match) and RAL 9005 (97.6% match). Given the influence of weather, water, sunlight, etc on the appearance and shade of any paint at any time the above is plenty close enough to model an accurate representation IMHO that is.
Following are model paint color matches for the two RAL colors above:
RAL 9011: Revell 8 (100%); Gunze 2 or 12 (94.81%); Modelmaster 2094 or 4795 (94.37); Vallejo 979 (94.30)
RAL 9005: Revell 7 (100%); Gunze 2 or 12 (100%);
Hope this helps,
Ernest