left rear replacement. I have the new one here

go to a local garage and it should cost no more than £30 or around $55 in america

go in to the trunk and move the carpet back that goes behind the tailight. Once you move it you will see 2 or 3 plugs for the bulbs remove those plugs with the bulbs. then you will notice several nuts that attach the tailight to the body. remove those nuts about 4 or 5 i think they are 8 or 10 MM and then remove the tailight. installation is the reverse of removal