do i really have to remove the bumper to change taillight lens?

both of my taillight lenses are broken and i an looking for replacements. they are the plastic kind with three mounting holes from the inside on a 53 hornet. i just looked and it looks like i will first have to remove part of rear bumper, then remove the housing and trim piece as one, then from rear of trim piece remove the screws to take off lens. is this right or am i missing something?