So our 2008 Seneca is the full paint "Dark Chestnut" option. I dont know which other years this scheme was available but i know it was a popular one on this chassis for at least a few years of production. I got a hold of Topeka Graphics in Topeka Indiana where my 08' was painted and spoke to them about the paint.. At the time they were spraying the coaches with Sikkens brand paint products. These Dark Chestnut seneca's used four Sikkens paint codes 55, 353H1, 352C3 and 308F1. These cross reference / were mixed from the following common mass produced automotive colors, i.e. these are the codes needed to have a body shop make up touch up paint or spray to match what was original.. GM paint code WA228A is the "Light Autumnwood" main cab color, The graphics and body are: Mercedes 474 "Peridot Brown", Toyota 141 "Silver or Silver Haze" and Chrysler QU1 "Dark Chestnut.
Sikkens 55 = General Motors WA228A - Light Autumnwood
Sikkens 353H1 = Mercedes 474 - Peridot Brown
Sikkens 352C3 = Toyota 141 - Silver/Silver Haze
Sikkens 308F1 = Chrysler QU1 - Dark Chestnut Pearl
Hope this helps those with the same full body paint seneca as ours.