Dick, According to the Buick Master Parts book (1916-1931) the 28-20 Buick(115" wheelbase standard) colors are Parkway Green, Atlantic Green, or Highway Gray. The Avenue Green was used on 28-50 Buicks(128" wheelbase master) with red stipe edged on each side with gold stripe on the center of the black moldng. Where did you get the information for Avenue Green on 28-20 Buicks? Gregory 28-20 Buick 2 dr sedan 27-47 Buick 4 dr sedan 27-47 Buick 4 dr sedan