FOr this kind of scale, just check out TOYS.

1/55 is almost 1/60, therefore the scale of most of miniatures cars toys, and even if there is but figures in a dynamic position, standing, maybe you can find some figures siting IN a car for example.

Some old model kits are not in the right scale so check out that too.

UltimatlyIMHO, I'd choose to modify what i've got in hands  Green stuff is the solution.