The first item is the convoy light. This mounted on a bracket on a rear crossmember and shone down on to the rear of the diff housing. A large white circle was painted on the diff, being illuminated it was visible to following drivers, but not presumably to Aircraft. It is essentially the same lamp as the front marker lights with an extension tube to concentrate the light to a narrower beam. It was wired as part of the tail light circuit and was switched between the tail lights and the Convoy light by the "Red-White Switch" at the rear of the chassis frame.
2nd item is a puzzle. It could be one of the clamps that holds the Vacuum hose that runs to the brake booster?
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