All that I know is that I was at this really great guys upolstery shop with my dad and he has a 1927 Rickenbacher he is in Camden Ohio which is close to Eaton Ohio his name is Elmer Reese of Reese's Upolstery he says there are only 8 cars left in exestience 5 which are straight 6's and 3 which are straight 8's and his is one of those 3.