I get asked quite alot how i made my rear bumper..
heres what i used...
EUDM corolla rear bumper
EUDM EK civic hatch number plate recess
Subaru impreza "hockey stick" spats and block spats
First cut out and mold the hockey stick spats to the bumper and fiberglass and filler them
then measure up the size you need for the rear plate and cut the recess down to size, cut the shape out of your bumper
fibreglass the recess in the centre
let it all harden up, sand it down properly, then paint it all