I do see an arch in the ends of the open-ended front bumper in the picture that Gary initially posted. The engineering releases that Frank posted of the open end front bumpers definitely show the pronounced arch at the ends, similar to the closed end front bumper on my mid-27 Coupe. If they were obsoleted on 9 November 1927, they could have been used into late November, using up existing stock at the Rouge Plant. A290, a Phaeton built on Friday, 5 Nov 1927 has the open end front and rear bumpers as does A354, a Sport Coupe, built on Monday, Nov 7, 1927. A 1519, a Roadster, was built on December 6, 1927, has a closed front bumper and open rear bumpers, similar to what are on the Edison Phaeton.