The length of the rear bumper arms and brackets for Models 160-B and C has been shortened 1″. The new short design can be easily distinguished from the long design by measuring between the bolt holes as shown in Fig. 1171. When necessary to make replacement of either a long design bracket or arm, it will be necessary to furnish one each of A-17911 and A-17912 rear bumper arms and two A-17798-B rear fender guard brackets, as the long design parts have been obsoleted and will not be held for service due to the fact there were comparatively few of these parts used in production.